Can't login

Can't seem to login to hotmail, yahoo, or facebook. All other websites are fine. Computer is otherwise working normally.
Can login from other computers apart from mine.
Just keeps reloading the login page when I try.
Have run AVG virus checks with no resolution of problem. Any solutions?

try clearing your internet cache
see
http://support.lexis-nexis.com/lexiscom/record.asp?ArticleID=wg_cache
for instructions

If that does not work, then post again as you could have a browser or DNS hijack

I've cleared the internet cache on both internet explorer and mozilla firefox but still no joy. Same problem with both browsers.

Logins usually use a secure web page with an address https://... instead of the normal http:// . I think it is possible that some setting is preventing you from accessing https pages whilst the majority of the internet remains accessible.