I hope someone can help becouse this problem is keeping me busy for verrrry long. My laptop acer 5520G has one sata port wich i wanna use for some things. I need a OS to work on and have a free sata port at the same time so i installed xp to my usb stick so i got a free sata port wich i can use. I can boot fine to the usb xp but as soon as i remove the hdd wich contains vista i get this message "missing bootmgr" and xp wont start up. I know the installation on the usb stick isnt corrupted becouse it starts working again when i recconect everything. Can someone give me some suggestion to try and fix this problem. Sorry for bad english Thanks in advance!