That's a very good card you are having, coming back, i think the problem could be due to some background application or the drivers for the video card, please follow the steps provided below.
Step1. Close any unnecessary programs running in the background.
Note: Please visit the following link if other than windows Xp.
http://support.microsoft.com/default.aspx?scid=kb;en-us;281965
a. Click on Start and select Run
b. In the Run box type msconfig, and hit Ok
c. On the "General" Tab, click "Selective Startup".
d. Remove the checkmark beside "Load Startup Group Items".
e. Apply the changes then close the Configuration Utility and restart your computer.
f. Once the has restarted, the System Configuration Utility dialogue box will appear.
g. Click the checkbox beside "Don't Show This..." and click "Ok"
If the problem persists, try the next step.
Step2. Update your video and sound card drivers:
First determine what type of video card you have. To do this:
-Click on Start button and then run
-In the open box type DXDIAG. Click OK. This will bring up the DirectX Diagnostic Tool window.
-When the tool finishes loading, click the Display tab for the Video card and Sound 1/Sound (for Win98/ME) tab for the Sound card.
-In the Device section, next to Name is the name/model of your video/sound cards.
-You may want to write those down. The Manufacturer is the company that manufactured your video/sound cards.
To find the latest driver go to the manufacturer's web site. They should have a support section or a driver section where you can find the drivers for the device listed in DXDIAG.
Follow the instructions on the manufacturer's web site to download and install the latest drivers.
If you can't find a driver or the manufacturer's site, refer to the documentation that came with the hardware or your computer for support.
