I have win xp media center, dell laptop duo processor, 1gb ram. use ccleaner, spybot s&d, spyware blaster, and adaware with avg anti virus.
Using 1.34.407 latest version of cc.
Every time I do scan for error and remove any items in cc I get and mmc.exe error after running defrag. I back up registry reinstall and all is fine. I have also ran sfc and reinstalled dll's from xp cd and repaired missing dll's. I have repeated this 3 times to ensure this is the same response and error. After sfc repair all is well, so scan now option is removing a dll related to the mmc.exe error.
If you know the exact .dll file involved "perhaps" registering it would help.
Example:
Start, Run, type in: regsvr32 "C:\windows\system32\dll file name.dll"
Then again Dial-a-fix may be able to fix it as I noticed some MMC related .dll file names in it under:
Registration Center -> Explorer/IE/OE/shell/WMP
If nothing else works maybe reinstalling MMC would help, you can download it from Microsoft located at (note the WinXP 32-bit download link is halfway down the page):