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Control panel
Region and Language Settings
On the Languages tab - click Details button
Ensure that you have The English (UK) keyboard installed, and if so set it as the default.
If it's not there, click Add and add it, then set it as the default.
Click OK
Sounds like the people who set up your machine were pretty careless, so you might also want to check the Regional Options tab, and ensure that that is also set to English UK.