Okay, since nobody likes long stories, I shall keep this as short as possible. I decided to merge a few partitions and resize them with Acronis Disk Director Suite in Windows XP x64. This all went fine. It booted back to Windows after it completed. But then I decided to change the drive letters (since they were not in order). And here the problems started; Disk Director did some things in Windows (without errors) then it rebooted (like normal) went to DOS, did a couple of more changes and synchronised the system (still all fine here). Then it try to reboot back to Windows XP x64, but it hangs on the Windows Logon screen (just a few seconds before you enter your password). I tried to be patient, but the screen remain the same. Apparently Acronis Disk Director didn't work that well after all. Now I have read most posts which were posted in this topic: https://www.wilderssecurity.com/showthread.php?t=174958. But I am still having problems to get Windows XP x64 back to booting normally. Currently I am using Windows Vista x64 (on the C: partition) to type this message. But I cannot seem to get Windows XP x64 booting up properly. And I use Windows XP x64 for my work. So you probably understand the seriousness of this problem. I tried the registry trick with the load hive, though it loads up fine under a dummy key, I cannot seem to see any differences betweet the two. Please help and advice. I really need to get Windows XP x64 back working... Thanks in advance! //edit #1 I gave Partition Commander 10 a go, but that program doesn't work to well; it says in Vista x64: Unknown Windows Version. I will give the other program a go which was mentioned here earlier in the topic. //edit #2 Well I tried several things, but still no succes. It just hangs at the light-blue screen with the Windows XP logo in it... So anyone who can help me out? Also more information; I have 2x 250GB HD's in RAID 0 configuration in several partitions; with on C:\ Windows Vista x64 On a 3rd HD, a single (different brand) 250 GB HD non-raid, I have 3 partitions one with Windows XP x64. I am really out of solutions. Can someone help me please?