Im unsure which OS I should use on my old laptop for college. Im currently attending John jay college and every computer there is using windows XP. So for reports, etc I would need it to be able to open and view on a windows PC if necessary. I currently have Windows Vista 32bit Home Premium. My system is as follows: I was looking into Windows 7 Home premium, or Ubuntu. *Im unsure but I believe my laptop wont run with 64bit Win7 but I dont understand the requirements for that. I need a computer that will shut off quickly for changing classes. I have to keep my laptop plugged in b/c this laptop battery wont last. Which would you recommend?