Which temp files? There are many things on a Windows system referred to as "temp" files. There used to be files in C:\Temp, C:\Windows\Temp, plus Temporary Internet Files, and now there are several folders under each user in Local Settings that hold temp files.
Most of these can be deleted using the Disk Cleanup Wizard.
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for internet explorer, go to safety, delete browsing history
for firefox, Ctrl+Shift+Del