window explorer hangs

i am using windows 2000 sp4, and just today this problem has surfaced.
whenever i click on a file in windows explorer, it hangs. clicking on a folder in folders bar doesnt hang it. if i select more than one file in explorer it doesnt hang either, ive solved the problem temporarily by going to "folder option>general>web view" and choosing "use windows classic folders" instead of "enable web contents in folders ". but i prefer to enable web contents in folders.
is there anyway to solve it?