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I use Vista and pay for the UK proxy.
 
As of a couple of hours ago I can no longer sign into Live Messenger, and the Troubleshooter suggested problems with proxy or firewall settings.
 
Then, Outlook Express could not download new emails.
 
Now I can no longer browse the web EXCEPT when the paid UK proxy is activated.
 
The only change I myself made to my computer tonight was to install the latest Quicktime version (I did a System Restore just in case, but no improvement).  I've checked Windows Firewall and Live Messenger is still allowed.
 
I really don't know what to do, does anyone know what could have happened?

Update:   I uninstalled the

Update:
 
I uninstalled the FoxyProxy video program which seems to have fixed the problem, and everything is working as normal again - except the UK proxy, which is giving timeouts.  I'm not sure if it's a temporary problem with the proxy or related to what just happened with my computer.  Apologies for such an all-over-the-place post!

Dear francisw, I have

Dear