I cannot seem to get to any log on page at all. including msn. internet banking. any ideas?? help!!?

I have been trying to log on to my internet banking msn ebay any login page and having no luck. i can surf and log on to yahoo but nothing else. ie says that i am not connected. i have it all set up on wireless so i thought that may have been the underlying problem. but when i plugged the pc str8 into the modem, there was no change. any ideas???
Answer
An old uninstalled version of norton anti-virus?? go here http://service1.sybloketec.com/support/tsgeninfo.nsf/docid/2005033108162039 uninstall and you will be able to log onto secure sites immediately.