When the laptop is switched on, and the desktop just opens it throws this error:

Data Execution Prevention – Microsoft Windows

To help protect your computer, Windows has closed this program.

Name: Generic Host Process for Win32 Services
Publisher: Microsoft Corporation

Please help me figure uout what this is for...

Check this out:

You receive a "Data Execution Prevention" error message in Windows XP Service Pack 2 or in Windows XP Tablet PC Edition 2005