disable aero!!

how can disable aero???. i have a problem with windowblinds6.....in the administrative acount i can aply themes without any problem, but when i use a standard account i don't know why windowblinds force the use of aero......before apply the theme i have it disabled but no matter what wb always force the use of aero in this account..........................somebody know how to make WB don't force the use of it........i really like the visual themes that come with wb6 but i don't wanna use aero for performance issue..........