you can check your shadow volumes. To even do this you'll need to enter services and see if the service is running (if it is set to manual then it will run when appropriate). There is a handy software tool called shadow explorer (which you can likely located via a search engine query or possibly on the Maximum PC website if they archive the content of cd's distributed with their magazine). Shadow explorer will allow you to sift through the shadow copy files made by Windows (in particular the system restore feature). I do not readily know where you will find the restore points in the shadow copies as I've never searched for them but you can likely find this out via an internet search as well. The real downside is that I'm unsure if the restore points being wiped out means that the shadow copies themselves are wiped out because shadow copies are essentially a quiet backup of your files from what I understand and they may remain so after restore points have been removed. I have yet to hear of a means of exploring the shadow copy files other than shadow explorer, but if a software was made that can find them someone knows how!
As Neil Jones above stated, what is the problem with your computer? someone here may be able to help you find a solution!
here is a link to shadow copies website! http://www.shadowexplorer.com/