Lost access to many, but not all web sites after last update: what to do?

On a Macbook pro, connecting via Orange broadband in the UK. suddenly only a few web sites could be accessed, even though email and skype worked fine.
I thought it was a MTU problem, so first tested with the info at this page:
http://docs.info.apple.com/article.html?artnum=303192
following those instructions, setting the MTU to 1458 which would appear to be the UK recommended value, and also setting the wireless router to that value made it work!
Great, I thought. But then, wanting a permanent fix, I followed these instructions:
http://docs.info.apple.com/article.html?artnum=107474
and checked the MTU after reboot! yes, it was still 1458.
But the problem had come back. I can only access google and some few other sites, not www.hp.com for example.
So I am at a loss.
I saw that at least one other person has complained about this problem on these forums...
Any ideas would be very welcome!
MacBook pro Mac OS X (10.4.9) running on UK broadband supplied by orange.co.uk
Mac OS X (10.4.9)
Mac OS X (10.4.9)
Mac OS X (10.4.9)

> suddenly only a few web sites could be accessed, even though email and skype worked fine.
Not quite sure what you mean here;
a) The DNS Lookup failed
b) The URL returns a blank page
Trace to www.hp.com using /Utilities/Network Utility/Trace tab
Does the URL resolve to an IP number OK, does the trace complete or fail ?

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HannahM15 wrote:
i recently updated my iphome 5c with the latest update and I have lost all my recent pictures except about 20, which means I've lost a lot of importants ones of which include family and friends ans I am not happy since they should not have got deleted from this update.
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 Cheers, Tom

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