Computer trojan?

We have 3 computers in my house, 1 of which we had only used for online games and such, but this computer did not have any anti-virus/anti-spyware software of any kind. After awhile the computer started acting up, and now whenever we even turn the device on it says it has a trojan that needs to be deleted, everytime this happens I go to download a anti-virus ect. but after only a little time the computer says it cannot function and shuts down. Is there any way I can make this computer usable again without going to pay 50 bucks at best buy or something of the sort, I really don't care if all the files are deleted I just want the computer to function again. Thanks!

Computer trojan?nortan antivirus

This is not a problem at all. Here's what you need to do.

1st, don't waste your time with AVG, true sword, spybot, ad aware, CA, spyhunter, superantispyware, avast, panda, kaspersky, spyware blaster, bitdefender, spyware guard, windows defender or anything of the sort. Stay away from anything that is FREE when it comes to spyware and antivirus. There is a reason why they free. They are NOT good.

2nd, You need some of the best software out there. Norton Systemworks is very good. That's the only good software from Norton. I wouldn't recommend Norton Internet security, its not that great. Now the best software you should get is Webroot AntiVirus With AntiSpyware %26 Firewall, formally known as Webroot's Spysweeper with Anti-virus, this software is too good and gets better everyday. This is Elite software. It blocks over 510,000 definition threats, which contain multiple fringerprints with each(you can do the math). No other software can compete with that or come close for that matter. It catches everything: viruses, spyware, adware, malware, root kits, keyloggers, trojans, worms, and anything else. It also has active shields and a Firewall which learns from your useage. I've used them all and it is 2nd to none.