Ive just started using this handy program called AAtools (http://www.wugnet.com/shareware/spow.asp?ID=445), was playing with the registry cleaner and wondering if someone could give me some advice as to what registry keys i should be using and which i can get rid of? The scan processed 178724 keys and it said that there were 90 "invalid entries". Here are a few examples of the "invalid" files : C:\WINDOWS\System32\MSXML3A.DLL PATH: Software\ Microsoft\ Windows\ CurrentVersion\ SharedDlls C:\WINDOWS\System32\blank.htm PATH: Software\ Microsoft\ Internet Explorer\ Main C:\Documents and Settings\Default User\Application Data\Microsoft\Internet Explorer\Quick Launch\Windows Media Player.lnk PATH: Software\ Microsoft\ MediaPlayer\ Setup\ CreatedLinks C:\DOCUME~1\****\LOCALS~1\Temp\_iu14D2N.tmp PATH: Software\ Microsoft\ Windows\ ShellNoRoam\ MUICache C:\Program Files\Real\RealOne Player\normal.vs|normal PATH: Software\ RealNetworks\ RealPlayer\ 6.0\ Preferences\ CurrentSkin C:\WINDOWS\System32\CMMGR32.EXE,1 PATH: Software\ Classes\ Connection Manager Profile\ DefaultIcon C:\Program Files\Real\RealOne Player\datacache.zip PATH: Software\ Classes\ Software\ RealNetworks\ Update\ 6.0\ Preferences\ Components\ Player Thats just a few. So can i delete most if not all of these? Anyone have any links where i can learn whats what? Or will i have to go through them all myself and figure out whats what? Also some keys seem to be listed from files that dont exist anymore so im guessing i can get rid of the obvious ones? Anyway thanks for any advice in advance. Cheers... Huey.