Hi everyone, this is my first post to the CCleaner Forums.
Anyway, index.dat files are "locked" by running processes such as outlook.exe and explorer.exe. To delete them, all you have to do it run a cmd prompt and task manager. Close out of Outlook and in TM kill the explorer.exe process. In the cmd prompt change directory to %USERPROFILE% and then do a dir index.dat /s. You also may want to try dir index.dat /s /ah and dir index.dat /s /as. You should be able to now use the del command to remove these files. Once finished, you need to restart explorer.exe, by statring it in the Comm