I tried to use System Restore today, and it refused to restore my computer to three different checkpoints over the past few days. None of these was a checkpoint that I had created - they were all system checkpoints of varying kinds.
I've checked that SR is switched on, and it is. Its drive allocation is set at maximum - i.e. 12% of a 200GB drive.
Fortunately it's failure is not a major problem on this occasion, but I'm worried that I might need it for something more critical in the future.
If you have SR active on more than your C drive, turn the others off. Worked for me the other day from a post here. SR hadn't worked for me for ages--first time I tried after swithching off D & G it worked. Just a chance....
Oops, forgot about this ongoing post…sorry! It is actually quite hard, sometimes, to turn off virus protection. I can’t comment on Norton (other than knowing it prevents restore), but I have had trouble with Sophos, and the only way to turn it off is to start task manager and kill the appropriate processes. To do this, you need to know what they are, of course.
I suspect that by starting in safe mode, the AV processes don’t get started in the first place.
Either method should work, and by the sound of it, the safe mode trick has sorted you out.
Oh, also, the problem only seems to occur when you try to restore, not when you make a restore point, so all the so-called "non-working" restore points should work (at least that was true in my case).