My computer has 10.5 gigs free but the installer says i need 13gigs, can i just plug in a 4gig flash drive or something and would it be able to install like that?
Unfortunately, that wouldn't work. So, how about giving us a bit more information as follows:
What OS is currently installed on your hard drive?
What is the native size of your hard drive?
What are you trying to do (clean install, upgrade, dual-boot)?
What media are you using to attempt the install (CD, DVD, Flash Drive)?