I need an answer to my question and perhaps some solutions

.
When youtube video is played,It is stored inside
Temporary Internet Files(folder) in xp and it can be easily copied elsewhere but i found it impossible with windows 7.Since the temporary video is stored in
Temporary Internet Files/Low i can find the file but cannot copy it to other location or open it or do anything;It gives error:File is in use(opened by browser i.e youtube).And if i close the browser or play another video the temporary video file gets immediately deleted

.Is there any trick without using any videodownloading soft. to copy already played videos from
Temporary Internet Files/Low folder. PS I'm using internet explorer 8 on windows 7 ultimate.