What is it that you need? Software installation, or someone to physically set up the equipment, connect the cables, set up the printer?
There should be customer support (on line or by phone) from the company from whom you bought the computer.
You can also use the Geek Squad through Best Buy as someone mentioned.
Our high school has a social service club that does a number of things for the community while giving kids experience to put on their "activity resumes" for college. Sometimes they do computer set-ups for people who are technologically challenged. Call the Guidance Office and ask if there is such a club, and who the advisor is. Sometimes the Guidance Office posts one-shot jobs or ongoing ones for interested students. If there's a college near you, you could see if they have a job board too.
Good luck!