I've been tinkering with Windows 7 and somehow all my restore points got blown away. About this time I started having problems, especially when iTunes was running. Apps would hang, screen flickers, general sluggishness. Then on reboot, sometimes Windows wouldn't load. Error report said it was probably a problem with system configuration. At this point, I'd like to reinstall Windows without formatting and starting over. Is that possible? I don't really mind starting over from scratch, except for having to copy over all my music and data.
I've run chkdsk and sfc with no problems identified.
Still don't know what happened to my restore points. I run ccleaner but its never removed restore points before. I have more than 15 GB hard disk space, so its not a drive space problem.