Hi all,
Thanks for all the replies and interest!
Speedwagon, I didn't go for the upgrade install because it'll only install the 32-bit version, so I made sure I prepared the Acer Factory Default DVDs Vista install 1 and 2, Drivers and Applications non Disk 3, I have got some of the drivers to install and run OK now, but I've still got to get one for the WiFi, so I can get on-line and download direct to the 9920G.
Tom, Dave is spot on (as usual)! all I've got now is Windows 7 64-bit, I've lost all the extras and applications that come as a package (Works, Office, Digital TV) - the Acer upgrade doesn't apply to the 9920G, and as above if 32-bit Vista is loaded, only 32-bit Win 7 will install! I've not gone to Acer Technical Support yet - as that is a very expensive route. I am gathering the drivers from sources such as the one you provided, thanks.
Peter, I've tried re-formatting, but as soon as I try to load from the Acer back up disks or the Win 7 Ultimate 32-bit disk, all seems to be going OK, the load freezes up with an error message either 0xa000000e in the Acer back up, or 0x80070017 in the Win 7 32-bit.
Bearcat, yes I'm finding 4 partitions on one HDD, as installed originally by Acer, but I've not been able to alter the sizes or delete them (as yet). I can't Restore as the 64-bit version has overwritten the 32-bit install - a brand new unformatted HDD may be the only way to get over this little hurdle.
Thanks for all the help and suggestions, all are very welcome.
I wanted to warn others that installing the 64-it version may not be quite as straightforward as you'd think, and make sure you've got all relevant drivers before you take the plunge!