I've had a curious experience with upgrading to 10:10.

First, I always wipe my entire hard drive annually (at least) as a sort of
software spring clean. I have been dual booting for several years and have
always used the LTS version of Ubuntu.

When I install Windows XP I make two partitions, one for the Windows system, one
as an archive and leave a lot of unpartitioned space for Ubuntu.

Having restored XP and the archive files I have installed Ubuntu. The last time
I did so I used 10:10 (which is not LTS) and when the part of the process began
to select the partition for Ubuntu I was a little disconcerted to see that 10:10
was offering a reduced size of the Windows partition and the available remaining
unpartitioned disk space.

I have previously been offered to install Ubuntu on the largest free disk space
and always selected this option. This option wasn't (or didn't seem to be)
available on 10:10.

I eventually used 10:04 which went through with no problem. This offered to
install Ubuntu on the largest free space available.

I noticed this morning that an icon previously on the top panel has moved down
to the bottom panel.

This may be due somehow to me having reinstalled Ubuntu without completely
wiping the whole hard drive, I simply deleted the previous Ubuntu partition and
swap partition.

I have a 500 gig hard drive and usually wipe it with Darick's Boot and Nuke so
it may just be time for a more radical reinstallation of everything.

It's unlikely to be a Windows born virus problem because I hardly ever use
Windows.