So here is the deal. Apparently, my computer is supposed to be "the fastest one in the house" (according to my dad). But when I was younger, I downloaded Limewire, And all sorts of different fonts and cursors from sketchy websites (I was young and stupid apparently).
Now, my computer is really slow. It takes about 15 mins to boot up, and it takes about 10 seconds to just respond to my clicks.

I have removed Limewire since then, and tried to get rid of all of the fonts and stuff, but that hasn’t really helped much.

I have Spybot and Symantec to get rid of spyware and viruses, but it is still so slow.

I would ask my dad, but I don’t want him to know that I had Limewire. >.<

Is there a software I can buy that can help me fix it? Or should I just buy a new hardrive and start over?

Thanks!