System Restore is a waste of time. All it does is hog disk space and cause more headaches than it does solve problems.
Instead of wasting your time trying to "fix" it, go teach yourself how to implement a proper backup routine instead.
Second point; I have Windows 7 Home Premium as my OS, if I were to run the CD Windows 7 Professional would it do an upgrade without wiping out all my data or would it do a clean install and dump all my other programmes and data? Info much appreciated.
Don't quote me on it (because I've never touched anything less than Windows 7 Professional), however it would make sense to me that going from one Windows 7 edition to another is just a case of Microsoft tweaking the Microsoft bits and leaving your data alone.
But... ( I think you can guess what's coming next
) ....
ALWAYS DO A BACKUP BEFORE YOU PROCEED WITH ANY MAJOR COMPUTER WORKS (whether its an OS upgrade or anything else) ... and no, "System Restore" does not count ... by any stretch of the imagination.
Rant over. Thanks for listening.