To be honest, just treat yourself to a new laptop. In this day and age, any piece of technology over 5 years old is ancient. Plus, Vista was an awful OS. Windows 7 is so much faster, easier to use, etc. I'm sure this will draw some snarky responses from Mac or Linux users, but whatever. Depending on what you need out of a computer, you could easily find a decent one for well under $1,000.
spoiler alert: i linked this