There is only one save slot, and an auto save. It's an older Xbox 360, but New Vegas is the only game it seems to have had difficulty running. Should I buy it on PC? ATi Radeon 4250? GPU.
Brad, as much as i suggest purchasing it for the PC you have to ask yourself a few questions:
1. Is image quality important to me? Becuase frankly it sounds like your hardware is very out of date, you will have to play on lower settings to sustain a good framerate.
2. Is it in my finances to purchase/build a new computer? PC gaming has so many advantages over the console i won't derail the thread with the antics, but you will find that the PC version of games (with a good system) allows you generally to play with mods/custom settings, higher framerates, and better image quality.