For some reason it's gone incredibly slow, ie several minutes to open one page and lots of red crosses when it does finally open. Every other site seems fine. I have just installed Avast anti virus, could this be anything to do with it??

 

Nope, fine for me

Does avast have "Internet Security"?

 

Yes, it does. I've tried disabling it but the problem remains.

 

OK now I've uninstalled Avast and ebay still wont work!!! Help!!

 

...and now I've reinstalled AVG and ebay is working fine!

WTF was that all about??

 

This normally happens when you have the wrong MTU settings on a modem/router.

 

One of ebays servers could of course of been having problems and that just so happens was the server you where connecting to.

Try uninstalling AVG and installing Avast and see what happens..