I have Windows 7 release candidate; on my laptop and my desktop. On my laptop it's working fine. No glitches at all. On my desktop...it's a different story. This annoying brown box is always flashing on my taskbar. It either covers the windows that I have open (in the taskbar) or the whole thing. Another very annoying glitch is when I'm using any window (iTunes, Google Chrome, WordPad, etc.) This whole black box would cover the whole screen showing the cursor; small, big, huge. Minimize symbol; small, big, huge. Cursor loading symbol; small, big, huge. It would do this for about all the main icons that come with Windows 7. And, sometimes my screen goes black for a couple of seconds. Once, it was doing that so much in a period of time that I had to shut down my computer. I tried to take a snapshot of the glitches, too. Though, when I post them on paint, it's as nothing happened. The glitches disappear. Any ideas or suggestions on how to fix this problem?