odd Problem, TX LED...

I have a rather odd problem! I use to be able to upload sketches just fine, but then I tried to download a library, and now I cannot upload sketches, my previous sketch is still there.

I also notice when I try to upload a sketch the only light that lights up is the green LED and RX, but not TX. Why?

OS: Windows Vista 64-Bit\Windows XP 32-Bit Board: Arudino Duemilanove w/ 328 AVR

-Thanks! ;D

wow I downloaded it again, and on a fresh start, I got it to upload :D