slow computer please help

hello, i have been experiencing freezes, slowness and general crahses on my internet and other programs that i run on my computer. When i try to download or run programs they dont load and i get alerts saying errors, also things have been deleting themselves such as flash player.

I called a computer repair place and they want $50 just to look at it, and $80 per hour after that. I’m only in highschool and dont want to spend that kind of money and I have a paper due this coming week.

If I can get some help on how to fix it myself I would be very thankful.

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asyn