Without more details on what the DSL modem is doing and such (Solid DSL light, solid Internet light), I'd have to say right now the Virus you had on your machine might have had some fun messing around with the system. I've seen a lot of malware these days play around with the Internet Options in Windows. What's worth a check is to visit your Control Panel, and locate the Internet Options (usually under Network and Internet). From there, open the Internet Options, and choose the Connections Tab in the Internet Properties window, then click the LAN Settings button. If the options for using an Automatic Configuration Script and/or using a Proxy server are checked, uncheck those options. Also, Automatically Detect Settings can be enabled but it is not necessarilly needed. See if that restores access.
