Windows 7 beta build 7000. Using HP Pavilion dv9000, 64 bit proc and install, 4Gb ram. 7 has performed flawlessly until 2 days ago (no changes or new software has been added in the last 7 days preceding the problem). Start Button, All Programs, Accessories...only a few folders are left under accessories. Have no clue what happened to the programs etc. Maybe an update caused them to disappear? Any advice is welcome.