I have an Acer TravelMate 5730 that I upgraded to Win 7 when it was released. Everything went fine except the fingerprint upgrade.
I have been in contact with Acer email support many times in the last week, when their "solutions" wouldn't work, they finally had me contact Aceranswerme where I shelled out $60 for a technician to take over my laptop via internet and try to repair the issue. After 45 minutes of him uninstalling and installing drivers and even bringing in the "senior technician" I was advised that Acer fingerprint appears to have a compatibility issue with Windows 7.... and it's Acer who sent me the upgrade package! They hope to get the issue resolved in the next month or so.
BTW I'm still trying to get the $60 charge taken off my credit card !!!! That's the most frustrating part.