Absolutely. Download the AV removal programs for AV's you have used to remove any possible broken programs. I would also recommend running the free ESET online scanner set to remove any possible malicious programs and let it run to completion. Not any guarantees but that should get your computer in better shape to work on. Once it will install and run a AV you are on the right track. I would highly recommend staying away from AVG. When it gets broken it is harder to get rid of than the viruses. If you have access to another computer you could install your hard drive in as a secondary the Antivirus scan will be a lot more effective because you will be running from an Operating System that hasn't been hooked. A virus usually tries to disable your ability to remove it.