I had Vista RC1 on my pc for a little more than a day and Sat. night my disk drive disapeared. It was working fine up until than. It would'nt read the disks or anything, no error,s either. I look in My Computer and notice that the drive is no longer there. That was the major problem. I had some issues with the Media Center part of it not being able ot watch or listen to any videos or radio stations. the only music and vids I could watch and listen to were the ones I put on my pc myself. The other problem I had was I noticed that it took Vista longer to load anything, WinXP was faster. I fixed al of these problems especially my missing drive problem by popping in my pc's recovery disk, restarting my pc and thank God my drive read the disk so I am now back to WinXP, that was my solution to fixing these problems.