Any way to install XP Pro on Gateway Laptop with no Gateway discs?

My neighbor’s computer won’t start in safe mode, has a nasty virus, has had 3 years of her children installing and removing programs….to top it off, during her last move, she lost all the discs and documentation with this machine.
It is a Gateway W730 laptop. It had (has) XP multimedia installed. She went and bought a full version of XP Pro and asked me to help her.

Any hints, helps…..anything………Bueller????