The problem occurs because you're not an Administrator of your PC, then you probably run WinXP, Win2k or even NT, not Win9x or WinMe.
Under XP or Win2k, if your Login name is "Toto", and the system is installed on Drive C, then the directory you have to remove should be:
C:\Documents and Settings\Toto\Local Settings\Temp\_BSPST$_\ |