How to fix my computers hardware to accept my external Hard Drive?

I own a Maxtor 160GB hard drive that I was planning to use to put .mp4 videos on so I can view them on my ps3. I found out online for the ps3 to recognize the hard drive it is required to FAT32. I followed how’s directions but quit half way. Now when I connect the hard drive to the computer it does not recognize the hard drive. How do I fix this problem?
