Well, thank god for such an easy problem! Your temporary internet files are located at (assuming your USERNAME is DaveDodger, for example:
C:\Documents and settings\davedodger\local settings\temporary internet files\
However, to clean them out, it is very, very simple.
1. Open up an instance of internet explorer (I'm assuming that is the browser you use.)
On the menu bar at the top of the page, click on TOOLS, then click on INTERNET OPTIONS... from the drop-down menu. A dialogue box will open up, displaying the first tab, the General tab. It is divided into 3 sections with blue titles:
-Temporary Internet Files
To clean out all your temporary internet files, in the second section, in the middle of the window, click "Delete Files...", then in the popup window, ckeck Delete Offline Files, and press ok. Once that is donw, if you want to erase your cookies, click Delete Cookies, and press ok. To change how long pages are stored in your history (they are stored for quick access in the future if you go back to them), in the 3rd section on the bottom, "History", you can change the number of days in the "Days to Keep Pages in History" option.
After everything is done, press ok.
To perform a full Windows cleaning, either:
1. Click Start, My Computer. When the My Computer window opens, right-click on the C drive and click properties, all the way at the bottom of the context menu. A window will pop up with a graphical display of your hard drive, and in the middle of the dialogue box, towards the right side, click "Disk Cleanup", and it will scan your drive. Then, make sure that every box is checked on the list of things to clean up, and press ok. It asks if you are sure, press ok.
You can also get to the cleanup utility through the control panel, or you can click: start, all programs, accessories, system tools, disk cleanup.
Hope this helped. I know it seemed like a lot of explaining for such a simple task, but I never know what skill level my audience is, so I try to explain in the most thorough and detailed way possible.