I had the same problem. To rectify it I simply went to the Device Manager
and uninstalled both the Floppy disk drive and the Floppy drive controller.
Once you have done that just scan for hardware changes.
Your floppy should now be A drive.

--
"George" <George@discussions.microsoft.com> wrote in message
news:A514658C-070E-4C95-92D6-7AA7F7FEA0BD@microsoft.com...[color=blue]
>i have been using Vista Ultimate for quite some time it seems now and
> suddenly last week I noticed that my floppy drive is now named drive "B".
> I
> have checked in my BIOS and that appears to be correct and I can't figure
> out
> how to get it back to being drive "A". I know there is little use for them
> these days but I tried to create a floppy for Seatools to run a diagnostic
> on
> one of my Seagate drives and I am told that I don't have a floppy drive. I
> am
> sorry but I can't seem to figure out how to change this drive back to
> being
> drive "A".[/color]