I have checked on this forum for possible answers, but did not see one for exactly my prob. Running Win XP Home, and trying to open up my jpegs, get message saying error in ntdll.dll, explorer.exe must close. Tried to use SFC, but it said to put in the Win XP PRO Service Pack 2 disk. My Win XP home disk did not work, and neither did a friend's XP PRO disk. Looking at the Add/Remove programs list there is about 8-10 hotfixes with Xp Service Pack 2 on them, so I guess that is going to be a future issue. Got the Ntdll.dll file off the XP Home cd, named the old one Ntdllold.dll, put the file off the CD in System 32, where the old one was. That did not work, and neither did grabbing the Ntdll.dll off a website specializing in dlls. What did work was installing Windows Home again (over top of itself) but who knows for how long this will work, as I don't know what caused this dll hell. Anyone know what is up?