Cannot create a new user account in vista home preium

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Via: http://www.jumlers.com/microsoft.public.windows.vista.general/

When I create a new user account in Vista Home Premium and switch to

new account I get invalid extension messages. and the sreen goes a

fully colour and all shortcuts on desktop are just empty .lnk files.

even if i go into control panel and try to start a program from

there a message says invalid extension. All other (older) user

account work fine. I\'ts just the ones I try to create.

Thanks