Unusually high latency after Windows 7 update?

I usually get around 150ms while playing normally on WoW but last night I had to install a fairly large Windows 7 update for my computer.

I logged in today to see that WoW was giving me nearly 1kms (Home and World added together and its been the same all day. Testing my ping on speed checking websites tells me that I have 70ms and some games on Steam show 150ms, which are both normal.

Can anyone shine some light on this situation for me please? :

 
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