желательно бы ошибку увидеть, но думаю связано с boot.ini

авторAnother little nastiness with XP is that it "remembers" its surroundings. It doesn't only keep track of the systems hardware and moans if "too much" of it is altered but also stores data about the partitions it's "surrounded" by in its registry-key HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices This includes hidden partitions, too! If one simply clones such a XP and boots the new system, the environment stored in its registry doesn't fit the one it actually detects and XP gets "upset and confused". In my case login was still possible but followed immediately by automatic logout and system-freeze.
This can easily be circumvented by executing regedit and resetting/deleting the values in registry-key HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
During its next reboot XP will then regenerate them according to its "new" environment, which, by then, will have been customised by us.
очень похоже на твой случай.. взято отсюда
зы: если, конечно, совет Kew не помог :)