you might have tried this already but if not follow this
Click on 'Start' (usually bottom left)
Click on 'Control Panel' (Win200 users will need to click on 'Settings' first)
Find Date, Time, Language and Regional Options (Win2000 may just say 'Regional Settings'
Once the new window appears click on the 'Regional Options' tab and in the format dropdown select "English (United Kingdom)"
Click the 'Languages' tab and make sure you have "English(United Kingdom)" in the Installed Services box. If not click Add and select "English (United Kingdom)" in the Input Language dropdown and then select "United Kingdom" in the keyboard layout dropdown.
Click OK to return to the Language window. In the top dropdown (Default input language) select "English (United Kingdom)".
Click Apply and then OK
Finally click OK again and close down the Control Panel.
You may need to reboot the PC once you have made these changes.