2 things urgent help required

Hi all midnighters, First thinf first. I don't know if this is the right forum for these questions but here we go. First, can someone please tell me how to stop junk email. I have all the filters on etc but i keep on getting repeated emails from (excuse my language) ******** saying things like congratulations you've won the lotto in some wierd country or pass us on your details so we can rip you off!! I have replied to most of them to say f***off but its not getting through, even unsuscribing doesn't work. I need to stop it, it's doing my head in.
The second and more serious thing is when i try and open a link within a page, the page stalls and i get a message saying something like "END NOW" so i click on end now and then it comes up with send error report, which i don't do because it happens all the time. Its such a problem that i formatted the computer to original factory settings but it still happens. I looked at the error log and have pasted the message below....

Hanging application iexplore.exe, version 7.0.6000.16705, hang module hungapp, version 0.0.0.0, hang address 0x00000000.

Please help me. Im not sure if i have a serious virus or what the hell is going on,