TAKEN AT YOUR OWN RISK
Prefetch is designed to speed up program launching by preloading programs into memory - not a good idea is memory is in short supply, as it can make programs hang. To disable prefetch:
1. Click 'Start' then 'Run'
2. Type in 'Regedit' then click 'Ok'
3. Navigate to 'HKEY_LOCAL_MACHINESYSTEMCurrentControlSetContr olSession ManagerMemory ManagementPrefetchParameters'
4. Right-click on "EnablePrefetcher" and set the value to '0'
5. Reboot.