I did something to make my desktop go completely black with no icons only my mouse and the watermark of build 7100. i screw around with downloads and such so im not sure where i messed up...I am still running windows 7 ultimate rc. the computer was given to me with it already installed without vista or any other windows program to back it up...could somewone please help me? The error code reads after i log on as explorer.exe Thanks to anyone who can help!