Can I wipe and start over with Boot Camp - Windows 7?

I have a MacBook Pro that's had Windows 7 on it for about a year, ~6mo into that I added Parallels so I didn't have to reboot whenever I needed it...but holy-moly, my Windows runs exceptionally slow! My MBP has 16gb of RAM and it takes the simplest tasks forever to operate when I reboot in Windows [when I plan on using it for the entire day].

I have to think that somewhere along the lines my Windows got curropted somehow and it's performance has been reduced significantly. I am trying to update with the lastest Boot Camp drivers to see if that cures anything....If the new drivers don't seem to help, is there a way for me to completely delete the partition I have of Boot Camp and start over new? Should I just delete the partition and start using Windows solely through Parallels instead?

School is starting up and I'll be using Windows daily and need to get this resolved.

Thanks!

-Mike