I'm not able to save any files on an none apple external hard drive, what can i do to make it work?

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I'm not able to save any files on an none apple external hard drive, what can i do to make it work?
I bought a omega 320GB external hard drive so a friend could save the files off an old windows laptop i had but now when i try and open the files on my mac, it doesn't let me. i'm also not able to save any file on to this hard drive either! can some one please help me?
Repaly
The drive has the NTFS format, which the Mac OS can read but can't write to. Copy the files from the external drive onto your Mac, then reformat the external drive using Disk Utility, creating a Mac OS Extended volume and using the GUID partition scheme. Then you'll be able to write to the drive. Note that reformatting erases everything from the drive, so don't do it until after you've saved the drive's contents to other media.
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