Before using any of the Tweek programs, I was already having an issue trying to run the "check disk" utility in Windows. Nothing worked. I tried running it in safemode, using CMD line options, etc. So, what the heck, thought I would use your tweek that set the Dirty Bit Flag. Upon restart, it did not initiate the check disk utility either but I thought it was worth a try. No harm, no foul. A few days later I attempted to defrag the drive but noticed that my "C" volume wasn't listed. I believe this is because of the Dirty Bit Flag. I may be wrong. Is there a way to remove the Dirty Bit Flag using one of your tweeks? Thank You.