Internet problems. When i try to right click and paste something (even on "my computer") it will

Question

When i try to right click and paste something (even on "my computer") it will come up blank. It doesnt always do this. If i have too many windows open it will effect my toolbar. Itll show up black, won't let me search. I tried scanning my computer for viruses and spyware and nothing comes up. A couple times i did it in safe mode and it would find 2-3 viruses and get rid of them. I have trend micro, and it doesnt seem to find viruses.