Hopefully this is the right place.

My problem is this:

I click on a link in Firefox/type in a URL/use the search box/hit a button, basically anything that should take me to another page. Sometimes, this works wonderfully and I savour these few hassle-free minutes, however other times, the page starts to load for less than a second, the status bar proclaims "Done" yet I'm still at the same point I was. There are no errors, just blank tabs and old pages. When I open a link in a new tab, a nice (untitled) tab pops up, complete with URL in the address bar and Done in the status bar, but no page.

The same thing happens in IE, although this time I get "Internet Explorer cannot display the webpage." Windows Live Messenger gives me an error 80072efd, but all I can find on that are suggestions that it's a problem with their servers.

I can receive email okay, but sometimes cannot send it.

I'm running XP Pro SP2 with firewall enabled, have a D-Link DSL-502T ADSL Router and am on Xtra's Go Large plan.

Any help would be greatly appreciated.