Here is a list of ideas for your reference if you want to use your own PC to earn income.
1.   Provide computer-based office management services for attorneys
2.   Do word processing
3.   Do medical billing for doctors
4.   Do automated telemarketing
5.   Manage a church
6.   Start a computer user's group
7.   Learn to win at blackjack
8.   Bet on horse races
9.   Bet on pro football
10.  Sell computers from your home
11.  Provide medical information management
12.  Broker information
13.  Trade stock by computer
14.  Provide astrological services
15.  Offer an interactive electronic newsletter
16.  Produce book indexes
17.  Provide a computer-assisted booking service
18.  Make stock market investment decisions
19.  Do genealogical research
20.  Manage a band
21.  Manage a house or pet sitting service
22.  Track precious gems
23.  read more »