Photoshop Help...

My Photoshop flat-out won't let me put a drop shadow on my icon. Whenever I try to put a drop-shadow (or anything else from that particualr menu) on my text, I get an error message that says "Could not complete your request because of a program error."

If it matters, this is a trial version of photoshop. Thanks for your help. :)

EDIT: I think I was having computer issues, rather than Photoshop issues... I restarted my computer, and Photoshop worked after that...