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JSP pages failing to display

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", but all the links below still failed

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

HM Revenue and Customs
Forms failing to download

Pictures failing to display

Windows Update
When using tools --> Windows Update I was getting "Page not found"