External HDD

Hello,
I have a 250 iomega external HDD that when i boot it up in my windows 7 OS it asks me to format and it doesn't allow me to format in NTFS, only exFAT? And when i boot up the HDD in windows xp it asks me to format again but doesn't allow me to format at all. why is this happening? and many thanks in advance.....
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  1. have you downloaded windows service packs?
    also right click on the drive and run error checking tool maybe that will let you format the drive
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