I've been running Windows 7 Beta (Build 7100) for a while now. I am having two main problems. The first is that I get this kaleidoscope effect on the desktop, in the transparent borders, in applications (like Braid which I got off Steam), and especially when taking printscreens. It is usually temporary, but still annoying. Any ideas? The computer itself is 6 years old and I am planning on building a new computer soon.
Here's a sample of what happens when I printscreen neogaf:
The second problem has been happening in firefox for a while. Basically, whenever I right-click "save as" it freezes, and also anytime I have to access Explorer through Firefox (say to upload pictures to a website) it freezes. It works in IE, but firefox always crashes. Updated to 3.6 and it still happens.