Reboot your computer, and keep pressing F8 as it is booting. Once you are given a list of options, choose something like "Boot in Safe Mode". Let everything boot. Once you get to the login screen, There will be an 'Administrator' account. Log into this account. Once you have logged in, go to Start>Settings>Control Panel>User Accounts. Once in User accounts click, Change an account. Select the account you are normally on (the one you are on right now)and change it to an Administrative account. Reboot your computer and install the BF2 demo.
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