Solved: Unable to use system restore after installing SP3.

After installing Windows XP SP3, I have not been able to restore my computer to an earlier time. The system sets restore points and I can manually set restore points but when I attempt to perform a restore, it goes through the operation and returns the message "Your computer cannot be restored. No changes have been made to your computer. This has happened to my laptop and my desktop. I have a recent backup on the desktop so I can restore that way if necessary but my last backup on my laptop is about a month old.

Any ideas?

 

Bump

 

I didn't receive any help on this one but I found the problem myself. Removing ZoneAlarm Security Suite solved this problem and several other problems.

 

Thank-you for posting your solution as it may help others.