Buying a new computer is always fun, but since technology advances so fast especially for computers yours becomes obsolete within a year.
Now you can simply just get rid of the one you just bought and go get the newer model or you can upgrade it to current technology.
Most people are very intimidated by the idea of having to do their own upgrades.
I'm here to let you know it's not really as hard as you think.
It can be best compared to putting together a puzzle.
You have directions of how it's supposed to look like and it's your just just to piece everything together.
When looking to upgrade a computer you need to do the following.

• Read the full specifications sheet for your current computer
• Research the parts you want to upgrade on the Internet and see what others have done
• Make sure everything is compatible with each other
• Compare prices (if you have a strict budget)
• Order and then install

The manuals you receive with each item are very well written and illustrated to make upgrading a cinch.
Now if you don't feel like taking apart your computer and adding stuff yourself you can go to a repair shop they usually don't charge to much to put things together (In my area it's only $45).
Don't be afraid to look on Craigslist for computer techs who are willing to do it for cheap.
If still that doesn't please you or you find it more cost effective to go buy a new computer then by all means go ahead.
However you should do a good amount of research on all the important components like the processor, memory or hard drive.