set BIOS clock to year 2099
install vista, any edition without a key , wait until setup is
finnished,drivers installed etc.
Reboot Pc.
Set BIOS clock back again to real date 2006/2007
Wait until 30 days are over and wonder on why nothing happens.
(No, it wont go into "crap" mode, even not after 200,300,1000 days)
The "installed-date" timer in the registry is not capable of managing this
weird switch.