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Windows Update page not found

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
Forms failing to download

Pictures failing to display