Could this be the cause? http://support.microsoft.com/kb/950106 http://windowshelp.microsoft.com/Windows/en-US/Help/9812d370-e66a-451a-80c9-f028d402d4281033.mspx When starting uTorrent, if Vista does not prompt you to elevate the security, then the app will run as standard user from the above explanation. So that would mean trying to right click uTorrent icon and selecting "Run As Administrator" to start uTorrent or if uTorrent is using the method mentioned in the KB, the developer should read the KB and find possible solution to have the app notify Vista that it needs to elevate security at start. If another process such as indexing for faster search is running as admin or system privileges, then it would have a higher privilege than standard user, hence uTorrent would probably not be able to write to a file that is locked by a higher privileged account. http://support.microsoft.com/kb/931277 I think this KB is just doing a "shotgun" solution. The permissions are messed up because of XP created the NTFS partition with XP's accounts as owner. Vista doesn't know anything about XP's user accounts so it needs admin rights to write to the drive, but uTorrent was started as regular user instead of admin and get access denied. You could take ownership rights for files and folders via Vista or you could just have Vista copy the data to a new Vista formated drive and then format the problem drive and copy everything back which the formating of the drive would have reset the user permissions for Vista instead of XP. The average folks would not know how to manage permissions in Windows because they can be pretty confusing
