Off the top of my head I know six people who use PT on a windows based lap top.
DAE error -9129 or -9093 and "increase or decrease the buffer size" errors when running Pro Tools LE on a Intel Core Duo Laptop.
As of this writing, Intel Core Duo processors are not yet supported for use with Pro Tools. In order to be able to use a PC with an Intel Core Duo processor with Pro Tools, you will need to
disable Multi-Core Support in the BIOS.
To do this, go to BIOS > Post Behavior > Multi-Core Support. The options you will find there are "Enable" or "Off." Turn Multi-Core Support Off.
If you need help getting into the BIOS, contact your PC manufacturer
http://www.digidesign.com/index.cfm?navid=54&langid=100&itemid=22380