Hi, I first installed XP at C Drive. Then I installed Win7 at F drive. I uesd EasyBCD to manage the boot files and it worked fine. I also used Acronis to clone both the C and F drives as backup. Everything's fine until I brought a new hard disk. I decided to use Acronis backup files to clone both OS to the new HD. As 95% of the time I use Win7 now so I decided to clone Win7 backup to the C partition in the new drive. Then "ntldr is missing" starts appearing no matter what. I tried "clone win7 only" or "clone WinXP only" or "clone both W7 and WinXP at the same time" or "clone Win7 back to F drive and Winxp back to C drive" or "fresh reinstall new Win7 in F drive then clone Acronis WinXP backup to C drive" or many thing else, the end result is always "ntldr is missing" . I am sure both of my Acronis backup files are fine because I periodically recover the OS with the old HD. It seems the drive letters are messed but I dont know how to clean that up. By the way I tried to use "win7 installation disk" to repair the start up, still "ntldr is missing". Anyone can help? Thanks in advance and please excuse my english (not mother tongue)!