Dell Optiplex GX240 slow/freezes up

[msta999]

This is a Dell Optiplex GX240 desk top. It is mainly used for downloading music and movies, it has become very slow and sometimes locks up, when this happens, I open task manager and I see the cpu useage is at 100%. Looking for a way to clean it up and get some speed back or at least stop freezing up. It also takes a while for it to boot up, if it is shut down.

 

[msta999]

Never mind, I see this is the same place I asked help from last time.

https://www.techspot.com/vb/topic141456.html

I'll try to use the info already posted.