keyboard problem with upgrade assistant

MHR42MO

Bit poster
I tried to install Windows 8 Pro on Parallels 8 on my MacBook Pro (Mountain Lion).
The upgrade assistant required me to enter my e-mail address, but I could not enter @ with the key alt + @. I tried all the keys and combination of keys possible, but none worked.
Does anyone know what is wrong with the upgrade assistant or my keyboard?
Best regards
 
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