seen this happen in the past with my account, and it was due to corruption (usually the old NTFS corruption due to unclean shutdown--happens more often than people realize, especially with faster hardware). Happened to me a lot when I first transitioned to SATA and still had some IDE drives in the mix. You can get cross-linked files, or misaligned security descriptors....all kinds of weird stuff. Fortunately, Windows still comes with some tools to fix the normal stuff.
You could simply have some corruption in your swapfile or hibernation file if you routinely suspend/hibernate. This is actually a fairly simple thing to fix--they're temp files, so you can just delete/recreate them by disabling them, then re-enabling them. I usually disable hibernation, than the swapfile (calls for a reboot), then reenable hibernation and then the swapfile--this way you know everything is dumped/recreated cleanly.
The hibernation file can be toggled off/on by running powercfg.cpl from the start -> Run/Search box. The option to enable/disable it will be nested in it's own tab. Forget if there's a direct .cpl file for getting at the swapfile. Right-click My Computer, go to Properties, Advanced Tab, and click the settings button in the Performance section. Then go to the new Advanced tab there and you'll see a button for changing the swapfile settings. Select each drive and make sure the button is set so there is no paging file set in the lower section (make note of the previous settings, so you can set them back again later), click the apply/OK buttons and let it reboot when prompted.
After rebooting, just go back and turn hibernation on and restore the settings for the swapfile again.
If it's still freaking out after that, try running a disk check. Forget exactly what it's using now in Windows 7 (not the good old chkdsk from XP anymore)---but it's always been in the tools section when you right-click on your hard drive(s) in My Computer/Explorer and go to the properties for the drive. Run the full checks, and select the options to let Windows make repairs if offered (may get prompted to run the check during reboot, if so...let it do it). This can take a while....but may finally resolve the problem for you if it's due to the dreaded NTFS corruption that STILL plagues Windows.
Afterwards, might want to give the drive a good defrag also (utility also nested in the properties pages for the drives). After a while, files can get scattered all over the place. It just tightens things up and can reduce load times.

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