i have a hardrive that i took out of my comp it was fully working and full of my tunes and other stuff, now when i put it back into the mother board it reads as a foriegn drive

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the only thing i have done is re installed windows, i did use another copy but the only thing i have changed is the file sytem in the windows setup options from ntfs back to pal will this be the cuase of it not reading my hardrive properly, and is there any way i can get it to read without re installing windows.
any help appreciated