If this problem has been identified in another thread, then please accept my apologies and redirect me. I did a search and was unable to find anything, and consequently am posting this. My system has separate physical drives. One is for all system and program files. The other is for all documents and media files. When upgrading from Vista Ultimate 32 to Windows 7 32 all appeared to go well. However, now, the "document drive" has a problem. According to the Properties tab, all of my files remain intact. That is to say, the same amount of disk space remains as did prior to the upgrade. The folders are all there, but they are empty. It is as though Windows 7 deleted the files during the upgrade. I have removed the document drive and tried it on another machine with the same results, whether I examine it with Windows XP, or Vista, or Windows 7. The files appear to be missing, although the space that they would be occupying remains unavailable. I have tried a few file recovery utilities, both freeware and trialware, but none find the files. Fortunately, some of the files are backed up, but many are not. I have Windows 7 64 and 32 bit versions, Windows XP (and various Linux variants) running smoothly on other machines. I have not experienced this problem when doing a clean install, and really do not understand why the upgrade would affect a separate drive, unless it has to do with links from the system drive that are a part of the upgrade process... Windows 7 has performed flawlessly, with the exception of this one exasperating problem. If anyone else has experienced this or something similar and has discovered the cause and has a solution, I would appreciate it.