Update issue

When I try to update the virus database I get the message “Failed to update, please check internet connection settings”, and when I the use the update button in miscellaneous tab I get error 106. I did some checking and it seems that every program that uses automatic updates has this issue (Lavasoft Ad-Aware, ESET NOD32, even Windows Update doesn’t work - when I click the update link it redirects me to my homepage). Is there a virus that does that? I’ve caught a virus called “zpx2.exe” recently - it overrides proxy settings and sets it to localhost, but I did a scan with Dr.Web Curelt (since NOD32 didn’t work) and deleted it. Also, I use a wi-fi router (D-link DIR400), and my OS is XP SP3.