If you're not opposed to it, I would just back up all your important data and do a format/clean install of Windows with the startup disc they probably gave you with the laptop (since they usually don't give you an actual Windows disc. Unless they did, in which case that is great and use that). Do that, then make sure all your chipset/drivers are up to date as soon as it's up and running.
Sounds like you're having some pretty serious issues with the constant freezing and graphical issues. You could first attempt a simple 'repair' using the Windows disc. Not an install, but just a repair. Maybe some critical files are corrupt and causing the issues. Barring that, I'd try the 'backup and clean install' method prior to taking it to a shop.
Always been wary of buying a laptop for exactly these reasons. I can tear into a normal computer and find things wrong, but I just don't know enough about laptop hardware to feel comfortable opening one up. Seems like replacing bad hardware would just be a bitch, not to mention slightly more expensive.
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