Every time I plug in my WD Passport, it pops up tons of messages that ask me "Do you want to format G:\?" I tried formatting it twice, it says "Finished" and when I unplug the drive and plug it back in later, it asks me to format it again. I'm on Windows 7 if it helps.

Odd. Try this:
Connect the drive, don't bother formatting. Right click on My Computer (or just Computer from the Start Menu) and select manage. Click on Storage, Disk Management.
Look for the WD drive Right click on any existing partitions/volumes on that drive and delete them. Right click again and select Create partition (something like that, I don't have a drive to play with in front of me). Accept all the defaults but don't select quick format. Let it do a full format!
If, after all that, you still get that error, it might be the drive failing and you'll want to contact WD for a replacement if it's under warranty. If not, you can get another 250+G drive and swap it out yourself. :)