no ray0711, defragmenting your hard disk is a different thing.
Cleaning your system fromtemporary internet files is the same as deleting unwanted files created by your browser etc... They are used basically so that websites load faster, the majority.
Defraging your hard disk means arranging your fiiles, I'm not going into terms like boot sectors etc..., so that your system will find files faster. If you awnt to know more I've searched for a simple article for you on this link:
http://www.helpwithpcs.com/maintenan...nce-defrag.htm