You didn't mention your specs, but since it's 6 years old, definitely get a new computer. You probably can't upgrade to any modern hardware. If you're good with computers, you can build your own and it would be a lot cheaper.
Smosh tells CNET what it took to make it big online
Internet sensations Ian Hecox and Anthony Padilla discuss how YouTube has changed and why among all their goals, "real TV" isn't an ambition.