Also, if you put your down loaded Real Players in other than the default folder (My Documents, My viders, check this folder and the sub folder (Real Player Downloads) and you will find copies of all videos downloaded!
I add it to CCleaner In the CCleaner window go to options/Include/Add. Check Drive or folder, and browse to Documents and settings/(User)/My Documents/My Videos/Real Player downloads and highlight it. Then press ok. The next time you run CCleaner it will erase all files in that folder.
NOTE: do not do this if you download videos and do not put them someplace else. You will loose everything!