We need significantly more information here.
How long is "a while"?
Explain specifically what it is that you can/can not do, "intereact" can mean very different things to different people (even "desktop" can mean something completely different to non-techie people).
To me interact means that you cant move the mouse pointer, cant click on any icons, cant use alt-tab or anything (so PC is completely frozen)
What troubleshooting steps have you taken?