PCIlliterateGalThere is a great program
CCleaner, that many here at Bleeping Computer recommend and use. I use it my self.

QUOTE
Program Summary:
CCleaner is a freeware PC optimization tool. That removes unused and temporary files from your system - allowing Windows to run faster, more efficiently and giving you more hard disk space. The best part is that it's Small, Fast and Free!
Cleans the following:
Internet Explorer
Temporary files, URL history, cookies, Autocomplete form history, index.dat.
Firefox
Temporary files, URL history, cookies, download history.
Windows
Recycle Bin, Recent Documents, Temporary files and Log files.
Registry cleaner - Which is in the Issues option *Note: See Warning below
Advanced features to remove unused and old entries, including File Extensions, ActiveX Controls, ClassIDs, ProgIDs, Uninstallers, Shared DLLs, Fonts, Help Files, Application Paths, Icons, Invalid Shortcuts and more... also comes with a comprehensive backup feature.
Third-party applications
Removes temp files and recent file lists (MRUs) from many apps including Opera, Media Player, eMule, Kazaa, Google Toolbar, Netscape, MS Office, Nero, Adobe Acrobat, WinRAR, WinAce, WinZip and many more...
100% Spyware FREE
This software does NOT contain any Spyware, Adware or Viruses.
CCleaner quick tourCCleaner download pageWarningUnless you are an expert, please steer clear of the Issues option. As it involves editing the registery. Being as you are fairly new to all of this, it would be best if you did not use this option.
I also leave
Recycle Bin unchecked. Just in case there are some things I may need to restore to thier previous location.
I just delete files/folders manually from within my "Recycle" bin.
Take my word for that, I learned the hard way.