Yes, I've had problems accessing one particular website (www.ii.co.uk). I've had problems with McAfee before so I took your advice & got rid of it.
I installed AVG instead (I used to use AntiVir but, unfortunately, there doesn't seem to be a version around that's compatible with Vista) -
And surprise, surprise the website was accessed no problem at all.

At least this time I didn't pay anything for McAfee - It came with the Dell package!

Thanks for everyone's help

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