Somebody please help me my computer is badly messed up!!!?

so i was looking at some at tube and i accidently (seriously, i was trying to x it out) clicked the download on. suddenly my whole computer screwed up. all these anti virus things popped up and i downloaded spybot search and destroy and it got rid of all the 70 some viruses that attacked me except for two. i keep trying to delete these two viruses but they wont go away. theres even a thing that appears on my desktop when i turn my computer on and it says "uninstall anti spyware something" but it wont let me uninstall it (its one of the viruses i cant get rid of". my computer also says i have a trojan virus, and when i go online i get more popup anti virus things and my homepage is some antivirus thing. i cant afford to call geek squad or take it for repairs or buy anything. how can i fix it? is it fixable? somebody please help! im afraid theyll steal personal info! can they do that if i dont go online? agh!!!!!!