I'll share my first problem i had this weekend actually with my comp and perfect disk. Computer running normal, one night it auto restarts for its scheduled defrag of offline files. Thats fine. Turn my monitor on in the morning to find a nice error message just b4 the windows logon box should appear, entitles winlogon.exe, with the description of: the file odbc32.dll is not a valid windows image file, try reinstalling blar blar blar, and same error with sfc_os.dll. Now, i don't know why the hell that happened, but I couldnt logon, replacing files didnt work, nothing. Just a bit of coinsidence it happens right after Perfect Disk. Although, it hasnt put me of perfect disk, cause i, like many, have tried other defrags, and I favor this one. Dunno why it happened, but it ment i could give my comp a nice fresh install anyway!