Computer Virus

[JoJoYZF]

So some how my laptop caught a virus last night. I was messin around online as usual and trying to download some music on frostwire. Frostwire wouldnt connect and I had tried a bunch of things and ended up doing a system restore. Well it started working again and I checked out filehippo, a site that a friend mentioned to me that has a ton of free trials and versions of anti virus stuff. Since the downlaods were pretty big I decided Id do them today. Sure enough I restarted the computer since it was running and now its fully fucked up. It wont hit the internet, the windows that open look different (look like an outdated version), keeps telling me my computer is infected, etc. I cant get the antivirus program disc we have to install either. Im not real sure what Im going to do. A buddy of mine is hopefully going to check it out since hes a little better with computers, but I dont know if he"ll be able to fix it. Im open to suggestions since if I cant get it to work I have to buy a new one. The laptop is over four years old and still ran great until last night, but I cant see putting a few hundred dollars into a computer that old. Thanks in advance if anyone has any helpful tips.