Hi, Korgul, a few notes on that flyer...
You really need a
HEADLINE...
Something to "cue" people into reading your message.
Also, some other suggestions...
Most of your public is computer illiterate. Phrases like "Windows install", and "networks" are just not going to be understood by your "public" (i.e., potential customers.)
I would suggest you advertise yourself as a...
COMPUTER GURU for hire... "Your computer problems fixed quickly and easily!"
I believe that would be a good approach. Good luck, buddy!