I was sure I had a trojan or spyware causing this problem, however after cleaning the PC and applying updates using a search of “Windows Update” the error still occurred.
JSP pages hang, pictures fail to display and others give page not found
I changed the MTU value in my modem/router from 1492 to 1458 (my provider is Zen)
Now all the websites work correctly
List of sites
Windows Update
When using tools –> Windows Update I was getting “Page not found”
HM Revenue and Customs
http://www.hmrc.gov.uk/inheritancetax/iht-probate-forms/find-right-forms.htm
Forms failing to download
Ebay
http://www.ebay.co.uk
Pictures failing to display