You gotta lotta process running. Unless you use windows messaging I would check that and remove it. You're using SP2 how many of these security fixes do you have installed? http://softwarepatch.com/windows/index.html
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Essential
Windows XP Service Pack 2 (XP SP2)
Windows XP security update (July 2006) - KB914388
Windows XP security update (July 2006) - KB917159
Windows XP security update (July 2006) - KB917537
DirectX 9.0c (June 2006 release)
Windows XP security update (June 2006) - KB911280
Windows XP security update (June 2006) - KB914389
Windows XP security update (June 2006) - KB917344
Windows XP security update (June 2006) - KB917953
Windows XP security update (June 2006) - KB918439
Media Player 10 Critical Security Update (June 2006)
Media Player 9 Critical Security Update (June 2006)
Windows XP security update (May 2006) - KB913580
Windows XP security update (April 2006) - KB908531
Windows XP security update (April 2006) - KB911562
Media Player 10 Critical Security Update (April 2006)
Media Player 9 Critical Security Update (April 2006)
March 2006: no updates - see note
Windows XP security update (February 2006) - KB911927
Windows XP security update (February 2006) - KB913446
Windows XP security update (January 2006) - KB912919
Windows XP security update (January 2006) - KB908519
Windows XP security update (December 2005) - KB904706
Windows XP security update (November 2005) - KB896424
Windows XP security update (October 2005) - KB901017
Windows XP security update (October 2005) - KB900725
Windows XP security update (October 2005) - KB899589
Windows XP security update (October 2005) - KB905414
Windows XP security update (October 2005) - KB902400
Windows XP security update (October 2005) - KB905749
Windows XP security update (August 2005) - KB893756
Windows XP security update (August 2005) - KB896423
Windows XP security update (August 2005) - KB899587
Windows XP security update (August 2005) - KB899588
Windows XP security update (August 2005) - KB899591
Windows XP security update (July 2005) - KB901214
Windows XP security update (June 2005) - KB896358
Windows XP security update (June 2005) - KB890046
Windows XP security update (June 2005) - KB893066
Windows XP security update (June 2005) - KB896422
Windows XP security update (June 2005) - KB896428
Windows XP security update (April 2005) - KB890859
Windows XP security update (April 2005) - KB892944
Windows XP security update (April 2005) - KB893086
Windows XP security update (Feb 2005) - KB888113
Windows XP security update (Feb 2005) - KB885250
Windows XP security update (Feb 2005) - KB873333
Windows XP security update (Feb 2005) - KB891781
Windows XP security update (Feb 2005) - KB890047
Windows XP security update (Feb 2005) - KB888302
Windows XP critical update (Jan 2005) - KB890175
Windows XP critical update (Dec 2004) - KB886185
Windows XP security update (Dec 2004) - KB885836
Windows XP security update (Dec 2004) - KB873339
Windows XP security update (Dec 2004) - KB885835
Windows XP security update (Oct 2004) - KB885523
Optional updates
Windows Defender (beta 2)
Microsoft Malicious Software Removal Tool 1.18
SyncToy 1.2
Windows Media Player Codec Package
Free virtual CD ROM for Windows XP 2.1
Windows XP (Home Edition) boot disk
Windows XP autorun repair wizard
Windows Installer 3.1
Windows Media Player 10
Windows Media Player 11 (beta)
Windows Media Player DVD Video Decoder Utility
Windows XP fix for STOP 0x0000007E error in aec.sys
Windows XP SP2 - Loopback patch KB884020
Windows XP SP2 - 1394 Firewire update KB885222
Windows XP USB 1.1 and 2.0 Update
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Most of processess running on your system seem to be installed by you. I have problems loading pages sometime after playing PS2 online or after switching from the T1 line at work to the wireless setup at home. When that happens I go to the Control Panel>Network Connections and right click on my connection and select repair...it seems to work. You have a couple of anti virus programs running as well as different programs set for automatic update...all this combined can bogg down your system. Try to stick to one good antivirus program or else they can conflict with each other. Since you are using Fire Fox ,I doubt your browser is being hijacked. So that only leaves all those processess you have running in the background that may be responsible. Do a google on each process that you don't know about before you remove it. Especially those set to automatic update. And remove the windows messeger at startup. that can be used for remote access. also download a port scanner to see what ports on your computer open, maybe there are other things making a connection to the internet.
====================================
Essential
Windows XP Service Pack 2 (XP SP2)
Windows XP security update (July 2006) - KB914388
Windows XP security update (July 2006) - KB917159
Windows XP security update (July 2006) - KB917537
DirectX 9.0c (June 2006 release)
Windows XP security update (June 2006) - KB911280
Windows XP security update (June 2006) - KB914389
Windows XP security update (June 2006) - KB917344
Windows XP security update (June 2006) - KB917953
Windows XP security update (June 2006) - KB918439
Media Player 10 Critical Security Update (June 2006)
Media Player 9 Critical Security Update (June 2006)
Windows XP security update (May 2006) - KB913580
Windows XP security update (April 2006) - KB908531
Windows XP security update (April 2006) - KB911562
Media Player 10 Critical Security Update (April 2006)
Media Player 9 Critical Security Update (April 2006)
March 2006: no updates - see note
Windows XP security update (February 2006) - KB911927
Windows XP security update (February 2006) - KB913446
Windows XP security update (January 2006) - KB912919
Windows XP security update (January 2006) - KB908519
Windows XP security update (December 2005) - KB904706
Windows XP security update (November 2005) - KB896424
Windows XP security update (October 2005) - KB901017
Windows XP security update (October 2005) - KB900725
Windows XP security update (October 2005) - KB899589
Windows XP security update (October 2005) - KB905414
Windows XP security update (October 2005) - KB902400
Windows XP security update (October 2005) - KB905749
Windows XP security update (August 2005) - KB893756
Windows XP security update (August 2005) - KB896423
Windows XP security update (August 2005) - KB899587
Windows XP security update (August 2005) - KB899588
Windows XP security update (August 2005) - KB899591
Windows XP security update (July 2005) - KB901214
Windows XP security update (June 2005) - KB896358
Windows XP security update (June 2005) - KB890046
Windows XP security update (June 2005) - KB893066
Windows XP security update (June 2005) - KB896422
Windows XP security update (June 2005) - KB896428
Windows XP security update (April 2005) - KB890859
Windows XP security update (April 2005) - KB892944
Windows XP security update (April 2005) - KB893086
Windows XP security update (Feb 2005) - KB888113
Windows XP security update (Feb 2005) - KB885250
Windows XP security update (Feb 2005) - KB873333
Windows XP security update (Feb 2005) - KB891781
Windows XP security update (Feb 2005) - KB890047
Windows XP security update (Feb 2005) - KB888302
Windows XP critical update (Jan 2005) - KB890175
Windows XP critical update (Dec 2004) - KB886185
Windows XP security update (Dec 2004) - KB885836
Windows XP security update (Dec 2004) - KB873339
Windows XP security update (Dec 2004) - KB885835
Windows XP security update (Oct 2004) - KB885523
Optional updates
Windows Defender (beta 2)
Microsoft Malicious Software Removal Tool 1.18
SyncToy 1.2
Windows Media Player Codec Package
Free virtual CD ROM for Windows XP 2.1
Windows XP (Home Edition) boot disk
Windows XP autorun repair wizard
Windows Installer 3.1
Windows Media Player 10
Windows Media Player 11 (beta)
Windows Media Player DVD Video Decoder Utility
Windows XP fix for STOP 0x0000007E error in aec.sys
Windows XP SP2 - Loopback patch KB884020
Windows XP SP2 - 1394 Firewire update KB885222
Windows XP USB 1.1 and 2.0 Update
====================================
Most of processess running on your system seem to be installed by you. I have problems loading pages sometime after playing PS2 online or after switching from the T1 line at work to the wireless setup at home. When that happens I go to the Control Panel>Network Connections and right click on my connection and select repair...it seems to work. You have a couple of anti virus programs running as well as different programs set for automatic update...all this combined can bogg down your system. Try to stick to one good antivirus program or else they can conflict with each other. Since you are using Fire Fox ,I doubt your browser is being hijacked. So that only leaves all those processess you have running in the background that may be responsible. Do a google on each process that you don't know about before you remove it. Especially those set to automatic update. And remove the windows messeger at startup. that can be used for remote access. also download a port scanner to see what ports on your computer open, maybe there are other things making a connection to the internet.