Kaz and panic
you can either
configure your system so that you can see hidden and system files .... and go hunting....
they live in c:\windows ....... see
http://www3.telus.net/dandemar/spack.htm
alternatively you can
download cc cleaner ..... and let it do the job for you
(including the entries in add remove progs)
don't forget ...
the files you are deleting are the old backups ..... not the updates .... so as long as your system runs OK for a week or so It's reasonablt fair to say it's OK to delete.