Unless I'm really missing something here, you guys have completely misread this post as its about a LAPTOP... Many laptops can not be upgraded, period! There are a few that have removable processors and such, but many older machines in particular don't... But even if you could upgrade it, you'd be rather limited. Of course you'd need another mobile processor, same socket, etc... I seriously doubt it's a slot processor in a laptop, and I don't think(but I could be wrong) that they used a standard 370...
Probably best to just sell and upgrade to a new laptop, as you'd probably end up spending about the same amount trying to upgrade this one if it's even possible.