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I use AdFender. I therefore had a look at it as I was going to close it down and test again. One of the options it gives in the Control Panel is to inspect and delete cookies. Both of these redirectors were there so I deleted them. That seems to have cleared the problem and I can now go straight to the Co-op and Microsoft pages. However, before I made my original post I ran CCleaner to get rid of all cookies in case this was contributing to the problem. Somehow these redirecting ones managed to remain.
Hopefully that is an end to the problem. Let me thank you for all of your time and assistance.