First of all Welcome to Mera Windows Forum and you will enjoy and learn more here about Microsoft Technologies.
and Warm Wishes for Happy New Year 2008
Which is your service pack of Vista ! I mean Vista RTM (Service Pack 0) or Service Pack 1
If Service Pack 0, then Use VistaGlazz to use non-ms style theme. Use the Aero VG and make sure in Personalize properties Enable Transparancy is checked.
If Service Pack 1 then use Tuneup Utilies .Use the Aero VG and make sure in Personalize properties Enable Transparancy is checked.
You can use Tuneup Utilies for Service Pack 1 also.