Really slow clients and redirected files on SBS 2003 machine

Hi,
I have set up a group policy for a number of my users,
that has redirected my docs and desktop to our sbs 2003
machine. For a few of the users many of the files that
were on the desktop have disapeared. They have obviously
disapeared off the server aswell. Does anyone know what
causes this?

Also for a few users another folder has been created
where the redirected files are held. The exisiting file
is there but another file with _NTFRS_1c02aa8d infront of
the users name has been created as well? Has this got
anything to do with the disapearing files?

Also the users are experiencing delays when trying to
access the files that are redirected and login seems to
take a very long time as well. Is the redirected files to
blame on this as well?

Thanks,

Dave