LOL - OMG I swear I wish I had the 80's back again..no computers

Ahhhhhhh the good ol' days huh?
Ok..if I do a reinstall - is there a way to do it w/out backing up EVERY single thing I have on my system and totally blowing the harddrive??
I have all the discs that came with my PC - just not sure which ones to use in this instance...