Be careful with XP and Win7 as multiboot,
Use 2 drives one for each OS
Do not install win7 while the XP drive is connected (or visa versa)
Then connect every thing and boot to bios
You should change root drives and boot (XP or W7 drive) from the BIOS/CMOS not with a boot manager
Set XP not to monitor recycle bin where win7 is
and tell win7 not to monitor XP recycle bin
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