This problem can be solved easily. It is your anti-viral program interfering with your attempt to do a System Restore. Even if you THINK you have turned it off. It stays on, at a level where it no longer warns you of bugs but still resists a System Restore
attempt. Norton is most notorious for this. You may think that you have disabled or uninstalled your security program, but likely you have not. They are tenacious programs. Even after my 60 days of free Norton ran out, after I bought my new system, I continued
to receive regular pop up messages on screen warning me that I had no protection. The fact that I kept getting these messages was proof that Norton was still alive on my computer, fighting for its survival.
Even if you think it is not active, you must remove your AV program completely. Tear it down, rip it out, put a stake through its heart. For Norton, there are two levels of Uninstall: one that merely cancels your subscription to the service and supposedly
"disables" it, and another deeper Uninstall that completely removes all traces of it from your hard drive. Your are warned against doing this. If you want to use System Restore, which of course is a far better cure for a malware crash than the standard AV
security programs, you have to get rid of them. And trust Microsoft. I know, I know, that goes against everything your geek friends say about Microsoft, but this time it's true.
What I did was this: I went to MS and subscribed to their totally FREE Microsoft Security Essentials (which is every bit as good as Norton or McAfee, and which regularly updates definitions, warns you of any bugs on your computer, etc.) Then, being well
protected, I found the Norton files still on my computer and removed every last one of them. After that I was able to easily complete a System Restore . . . even with MS Security Essentials live and operational.
So you have to completely and utterly remove the commercial anti-viral security software that you have, trust that Microsoft's free software is every bit as good, and then you will be able to protect your computer at all times and still perform a System
Restore. You do NOT have to turn off MS Security Essentials to perform the System Restore.