A trojan virus has infected me; no anti-virus protection; unable to use my internet?

[melforeverx]

Pleeease help me!! I have not backed up my files. My computer desktop has changed to black and says that "my computer has been infected by a trojan virus. Check windows security system to dowload an anti-virus". It does not let my Internet load. I have NO anti-virus software. Things keep popping up. My computer is sooooooo slow. Please tell me what I can do without losing my files. I need anybody's opinion. I am now using my dad's computer and he does not have any anti-virus either so i do not want to infect his computer either. So, pleeease if anybody has a heart, help me out =D I beg you. I have finals coming up and I can't use my computer. I am so dead.

 

[AF+AO]

You are going to have to go get it cleaned. this happened to me recently. if you go to best buy you can get it cleand but it will cost a lot, maby $200, but we went to a guy who did it for $99 and our computer is working better than ever, sinse we all had our own accounts on our computer, we had different files and they all got transferred into one account althoough all my files stayed, some of my sisters were gone, so i guess when you go get it fixed you tell them you still want your files. sorry i couldnt be more of a service