"upgrade" vista to xp?

[capiendo]

WinXP Home Ed. Upgrade is not recognizing my Vista install as an upgradeable previous Windows OS. is there any way of fooling it so it does install? or am i just gonna hafta get a full version of XP.

Vista is not playing nice with my old games, that's why I wanna go back to XP. i'm on a Mac mini dual booting Vista with Boot Camp.

 

[nerp]

XP home from Vista is technically a downgrade. You need to find an old Win2k, 98 or ME disc to insert as qualifying media during the install process or you need to get a full retail or OEM version of XP.

 

[capiendo]

so there's no way of fooling the Upgrade installer? what is it looking for exactly? a registry hack, maybe?