Did the System Restore work?

If it didn't:
Is it a laptop or desktop/tower?
What operating system are you on?
Have you changed any system-wide/BIOS settings, prior to the hiccup, and if so, what?
How has it being acting up, prior to the hiccup?
Have you recently installed or removed any hardware?

It's entirely possible that it's just the OS that's gone bust, so there's no need to get a new computer just because of the OS; if this is the case, just reinstall your OS. There's two sides to a computer: hardware and software. There are a shocking amount of people out there who waste a perfectly good computer, because their OS got clogged up. To me, a computer is what you can physically see. The OS is just, ... kinda like toast is the heated bread, but the butter is the addon. Some like marmalade (Mac) some like butter (PC) some like jam (Linux) and there's plenty of other, less-common toppings.