Some videofiles that I download cannot be deleted. When I try to delete them it says that the file is being used by another person or program, which it' s not of course.
The files slow down my whole computer. I' ve checked for viruses and spy-ware/ad-ware but nothing has been detected.
I have Windows XP Home Edition

How do I solve this?

I' ve heard of others having the same problem and they were recommended some kind of deleter software but I don' t know anything about that stuff so I was hoping maybe one of you guys knew anything...

I appreciate any idea that might help.