In Windows XP temp files are not just stored in x:\Windows\Temp. To find the rest of the temp files for deletion do the following:
1. Goto Start >Run
2. Type in:
x:\Documents and Settings\Your User Name\Local Settings\Temp
x = the drive letter (will be C: if you have just the one OS installed)
Your User Name = the name you logged in with and entered during setup
3. Click OK.