Many people mentioned the Refresh Rate as well. I didn't mentioned that before, well mine is set to 75Hz. What's the difference between a 60Hz or 75Hz or 85Hz. I can't feel it in my screen. Can anybody please explain? Thanks.
~*McoreD*~,
The Refresh Rate is how fast your screen/monitor gets updated with the current picture. The faster the rate, the better. If the rate is really slow, you might see the screen filicker a bit. Remember just because you might have Windows set for a high rate, you can't get anymore than what your monitor will allow and trying to can damage your monitor.
Here's a good info source with pictures:
http://www.d-silence.com/video/refresh.shtml
EDIT - After reading the entire article using the link above it says this at the end of the article:
Since Windows XP came out, much of this article no longer applies. However, Win XP (and Windows 2000) bring their own problems with Refresh Rates.

Back to square one, but it still more than answers your question about what refresh rate is.