First, Unistall the loader To be sure of this: Boot up the PC from your Windows installation disk Select the "Repair your computer" option Select "Command Prompt" Input "bootsect.exe /nt60 SYS /force" (without quotes) Restart the PC Note: If the above doesn't fix your boot issue then use the command "bootsect.exe /nt60 ALL /force" instead. Just make sure you remove all USB flash drives before you use the command. After this check the bios with SLIC Toolkit, Advanced Tab
Do you have any reasons to use the outdated WinXP? Just install Win7, apply Cert. and OEM:SLP key and enjoy !