i "broke" my computer

yeahhh. defiinitely did.
i thought i was being all smart and had a good idea to save memory or something so i removed microsoft 2000 off our programs list because we have microsoft 2003 so i figured it didnt matter. nope. it mattered.
now we don't have any microsoft program access on any of the accounts and i swear our internet gets slower every day. we dont have dial up but we might as well because it took like five minutes for our home page to load and it when somthing finally loads most of the time it says it can't find yahoo as my home page.
ugh.
oh and we cant print anything either. dont ask me why all of this is happening because i pressed the little "remove program" button for one thing. SO, now we have to spend money to have someone come look at our computer because we have no idea whats up.
i have everything on my USB drive now and i have to do everything at school at break or in the mornings.
:/
i feel like "oops" won't even begin to cover it.
any ideas?