Reformatting the drive won't help anything in your case. You should always have a backup of the files you'd mind losing.
I have Windows 7 on a Boot Camp partition on my MacBook Pro. However, I find that I don't need it anymore, as everything I use now is Mac compatible. My question is: When I remove the Windows partition and restore my hard drive to just OS X, is it a good idea to backup my Mac data and reformat/reinstall OS X as well?
Any advice would be much appreciated.