SWEPs wont work.

Dont rant if im not in the right section for help on this subject but heres the scoop. Lately I have been getting bored of just building giving me time to get some SWEPs and such. Previously before my system restore I didn’t have this problem. The problem is, when I click on the SWEPs that I wish to use they don’t come at all. I right-click them their models appear and I try to pick em up and I do but it doesnt show up at all. This same problem is going with the SENTs. So im asking anyone who has either gone through this problem or knows how to fix it to help me.