Cannot Download From The Internet

I have read many persons posts, but none have been quite the same as mine. With many tips, but no further explanations for the questions I have. I have a DELL Ispiron with Vista Home Basic 32bit and I use Internet Explorer. I am able to download absolutely nothing from the internet. I have a feeling it has something to do with the incorrect installation of AVG. A week ago, I wanted to try a different sercurity program, while keeping AVG. I downloaded Online Armour from cnet.com and after a couple of days uninstalled because I didnt like it. I figured I would just update AVG 8 to AVG 9, so I went to AVG Free - Download installation files & documentation, I think I should have downloaded the recommended installation, but instead I selected "intallation files" and selected one of those options. Now it list in my program files AVG 8 and AVG 9. In my programs, selected Windows Start>Programs, it list AVG 8.5. Now I read somewhere, a person with practically the same problem, that I could uninstall and then reinstall AVG and the problem could possibly be fixed. Also if problem persisted to try uninstalling AVG while in Safe Mode. I could do neither. Under program files AVG 8, selected Windows Start>Computer>Hard drive(C)>Program Files>AVG>AVG 8>setup, has a setup option. But when selected reads, setup window:Installation failed. Then selected Details reads, setup window:Installer initialization failed due to following error: Error: @AvgErrorCode_0x0253 %FILE% = "C:Program FilesAVGAVG8" @AvgErrorCode_0x0020

Under program files AVG 9, selected Windows Start>Computer>Hard drive(C)>Program Files>AVG>AVG 9, has no setup option, I assume I did not install the correct file, my mistake. Under my programs, selected Windows Start>All Programs>AVG Free 8.5>Unistall AVG Free, it list AVG 8.5 and when I try to uninstall the the same error occurs. I dont know if this is the reasoning for my issue but this is when the problem started. However I would still like to know how to remove AVG as well as the initial "fix." If this possible, should I delete the AVG program files one by one, just by right clicking on them and deleting? I also tried to run a System Restore thinking it would go back to a previous date before I changed anything, but the earliest date I could choose from was not soon enough. It did nothing except remove some updates and a toolbar that had been installed. Also, I am unable to install updates, I assume its because they use the internet to do so, idk.