I need tips from computer expert!?

I had a few viruses on my computer and i got a someone i know that's a computer expert and he/she took my viruses off and installed what's called AVG anti virus. Its work and i have no viruses on my computer. But i've had a pop up that's antispyware.... it pops up every thirty seconds saying i have... show more I had a few viruses on my computer and i got a someone i know that's a computer expert and he/she took my viruses off and installed what's called AVG anti virus. Its work and i have no viruses on my computer. But i've had a pop up that's antispyware.... it pops up every thirty seconds saying i have 12 virus when i went on AVG and said i didn't. it sometimes even closes my current window. Please help!
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