I can't run Virus scans or do Updates
Chances are your hosts file has been hijacked and modified. Your host file is used to tell your browser where it should find files/sites -- normally it's never used except by experienced users. By default, the only thing that comes with a clean Windows install in your host file is 127.0.0.1 Localhost. In essence what that means is that anything that has the 127.0.0.1 address in your hosts file redirects to your computer, hence making the webpage undisplayable (for example if you included 127.0.0.1
http://www.google.com in your hosts file you would get a page not found error, because your browser would be looking for google on your machine). What many new viruses / trojans attempt to do is edit your hosts file to essentially make most recognized antivirus proggies unusable, or disallow access to definition updates. This file is located in c:\WINDOWS\system32\drivers\etc. or c:\WINNT\system32\drivers\etc (depending on what version of Windows you use) and does not include a file extension. In order to open and edit it, you can use Notepad, but to see it, you must select "all files" from the dropdown menu instead of text .txt files. If this file contains anything other than 127.0.0.1 Localhost that you didn't add there yourself, then delete the additional entries and save the file (be sure to scroll all the way down as some viruses add their entries with many spaces below the valid ones.) When you save, select File and Save. Do not select "Save As" as this will by default add a .txt file extension and will make the file unusable. *note the host file in system32 is not the same as hosts.ics or lmhosts.sam. Do not confuse them.
By editing this file (without rebooting - rebooting may cause the file to be overwritten again by the virus), there is a possibility that you could now update your virus protection files or at least run online scans. It doesn't completely fix the problem but at least it's a start. Your best practice is to attempt to get a dat update for your Virus protection and then reboot to safemode and run your virus protection in safemode. If you have configuration options available, configure your virus protection to first "clean" infected files, and as a second option "delete". In my opinion Quarantine is useless. Why would you want to leave a virus on your machine? Get rid of it from the start. Your virus protection may or may not find anything, depending on how current the virus is, and how up-to-date your anti-virus definition files are.
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