If (when you can connect to the internet) you can only visit regular sites; and not any form of Update Service or Security sites, then it sounds to me that you are still infected in some way.
Read through the link (provided by Grif-M); the programs listed will provide you with the necessary tools to get your computer in order (if infected), also it will provide you with the information needed if there are programs that are conflicting with each other (eg: more than one antivirus installed).
http://forums.cnet.com/5208-7813_102-0.html?messageID=3313305&tag=contentMain;contentBody#3313305