On Windows XP Professional with SP3 and all the updates maintained current as they have been published and offered by Microsoft Update procedures : I have these folders in the CWindows directory... ie7 ; ie7 updates ; ie8 ; and ie8 updates. The ie7 folder is kind of small, at about 25 MV, but the ie7 updates folder is at about 290 MB. Since I am intending to stay with IE8, because of security reasons, among other considerations, may I simply omit the ie7 and ie7 updates folders? I would copy them to another data medium for storage for a while - but I would appreciate any heads-up if there may be some caveat. I also have about a gigabyte of $NtUninstall[XXXXX]$ folders which go way back in time... I'm getting quite a bit of conflicting information from search engines, and the Tom MSMVP tool did NOT work. Since everything is running fine, can I eliminate those folders, and correlating folders from within $hf_mig$ ? These take up significant space, especially if I would never intend to uninstall any of Microsoft's updates which are working just fine as they should. I'm also wondering why Microsoft does not publish either a tool to clean these old remnants, or some official instruction on how to accomplish this major maintenance? Also, regarding SFC \scannow : I installed this OS from the raw release with no service packs. As each of the service packs came out, I went with the program. Now, when I run the SFC procedure, I would require an SP3 disc (which I manage to do) or else I get all those incorrect disc error messages - which accomplishes very little if one merely clicks-through with the original OS disc. Why doe Microsoft not publish a downloadable file for verifiable Genuine Microsoft users to deploy with an appropriate SFC procedure which works? It seems like it would be so easy to do for them. OK, so, delete old ie7 remnant folders; old update folders/files; and access a current and appropriate bundle of system files to run the SFC, or similar to SFC, procedure. Thank you.