No! if it's up and running cool bananas!!....... you can Use Qflash to Flash to F5.... or if your not comfortable.....it will be fine to load window on at the current bios
Start loading up all the kit again a piece at a time with a boot in between .....the lastish thing you want to do after the Bios flash is load "Optimized Defaults".....this sends the board when booting-up to go hunting for everything and anything that connected.
Then when you have the OS done ....and all the drivers......then flash to the latest......now start enjoying the board......glad you had a board with a backup bios now
......going to bed now......1am
Aussie Allan
UPDATE Just read your post.....yes, start again 99.....and looks like you'll have to update the bios.....make sure you uncheck "keep DMI data pool"