Hi, I had this problem start a few months ago with a zip file that could not be extracted or moved, doing so would result in windows freezing up… but it was an odd freeze. I can move the mouse, move icons, get responses when mousing over the taskbar but attempting to open anything or close existing windows results in no response from anything, the mouse however can still me moved around. It never full locks or re-boots. The offending file was deleted and the problem stopped. A short time later, the problem returned and defragging became the main issue, I have a few files (main offender being a file in 3D mark 06) that when attempted to defrag freezes up as per the above, a major problem with Diskeeper on auto, it was like a time bomb. I excluded folders that caused issues and it stopped… for the time being. It's now back bigger and better than ever. I'm not even defragging and I get days where I restart the computer many times because it freezes, as per above, minutes after logging into windows, the all of a sudden it stops and all is good, for some reason I can't leave it on over night running torrents however, rarely is ever survives the night. I ditched Diskeeper and downloaded PerfectDisk, same problem, for the record windows defrag doesn't work either and it appear to only affect the windows installation drive. I've looked around and came across I program called Spinrite that may help on the assumption the are errors on certain parts of the drive that are affecting whatever happens to be on that part (I'm not technical when it comes to this kinda thing, my apologies for that terrible description) and though I don’t fully understand it, I'm willing to give it a go. Damn… I wrote a novel. Anyway, hoping I'm not the only one out there that has experienced this… It runs fine when gaming but leaving it on overnight and defragging causes issues.