You say "I have asked avanquest". Why not call Ancestry dirctly? Phone Numbers at http://c.ancestry.com/Affiliate/Knowledgebase/contact/contac...
You might try "restoring" your Windows to a date prior to the first attempt at install. Then fire up FTM to see if it will install (kind of like starting over).
You might try "restoring" your Windows to a date prior to the first attempt at install. Then fire up FTM to see if it will install (kind of like starting over).