Have you actually done the system restore yet?

If not there's a number of things you can try before resorting to that

 

Click on My Computer and in the window that opens you will see an address bar at the top, type in C:\Documents and Settings\YOUR USER NAME\Local Settings

In the folder that opens there should be 3 subfolders

HISTORY      TEMP    TEMPORARY INTERNET FILES

Open up the temp file and delete all the files in there, first time I did this there was over 3000 items in there!

 

Click on My Computer then right click on Cdrive and choose properties, then click on Disk Cleanup

In the first window delete Temp internet files, Recycle Bin and downloaded Program files

 

If you have adaware and/or Spybot  update and run both and then run your AntiVirus program

 

Go to start/my computer and right click on Cdrive and choose properties click on tools

Click on errorchecking and when thats done click on defrag now

 

Reboot the PC

 

Click on start/all programs/accessories/system tools/system restore

In the window that opens you will have 2 choices, Restore pc to earlier time and create a restore point. Choose create restore point and follow the instructions