You easily find a guide online on how to dual boot XP and Vista. The XP drivers are hard to get but some in the forum had hunted them down. A search should lead you to them from their threads.
I think most Gateway laptops have an integrated bluetooth module on the motherboard but I'm not positive on that. I haven't seen a module for Gateway like how Dell has one.
Well the first thing I read was screech which hard drives normally do when they go bad since it's one of the only mechanical objects in the laptop to make that noise. Check the processor, it might have been overloaded someone and the...
It's hard to diagnose but you can try removing the battery, hard drive, cd drive and see if it boots. It can still be a motherboard or cpu problem but you can always try.
Are you using the supplied reinstall CD or another OEM version? This is happened to me when I try using an OEM XP disc then I had to call Microsoft to get an activation code.