How much RAM do you have (right click My Computer / select Properties / under the General tab, how many MB of RAM do you have)
How much free space do you have on your harddrive (double click My Computer / right click C: drive / select Properties / under the General tab, Free Space)
Have you installed any new hardware/software recently?
Have you updated, and run your antivirus?
Have you done any online virus scans?
Have you run any Spyware/Malware programs?
What Spyware/Malware programs do you use?
Were there any error messages?
If so, what was the exact
The following is a registry edit.
Improper changes to the registry could render your computer inoperable.
Remember to backup the registry, before
making any changes.
Instructions, on how to do that, can be found here:How to back up, edit, and restore the registry
Here's a couple of things you can try, that might help:kellys-kornerRestore Help and Support Service
, on the LeftRestore/Enable System Restore
, on the Left