Useful links.
These links are not a comprehensive listing of the resources available, nor is their inclusion intended to be implied as a recommendation. They are here as a quick reference to the common tools mentioned in the forum, or as reference aids for further investigation.

Due to the poor search facilities of the AVG Technologies virus encyclopedia finding information on specific viruses can be hit-or-miss.
Search for virus names by vendors at http://www.virusbtn.com/resources/vgrep/index.xml

Got a file you aren't sure is infected? Upload it to http://virusscan.jotti.org/ or http://www.virustotal.com/

Not sure if AVG is detecting viruses? Virus test file http://www.eicar.org/anti_virus_test_file.htm

Not sure if that .dll is needed? Check at http://www.systemfiles.net/

Need information about what process has a file open/locked? Try process Explorer
http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx

AVG Technologies removal tools http://www.avg.com/removal

Browser alternative
Firefox http://www.mozilla.com
Chrome http://www.google.com/chrome/
Opera http://www.opera.com/

Other useful links

WinSock XP Fix
- It is used to fix WinSock layer in a case that the network connection has been lost (e.g. due to malware removal, firewall drivers removal).
http://www.snapfiles.com/get/winsockxpfix.html

If you feel, that something should be added, contact moderators (new thread).