Assuming you are user "myname", your Desktop Layout is stored in c:\winnt\profiles\myname\desktop folder. If you have read access to it, you can copy its content somewhere in a safe place on your harddisk. You can then restore it anytime (if you have "change" permision on the c:\winnt\profiles\myname\desktop folder ). Of course any restored desktop icon that points to an (in the meantime) uninstalled or deleted application will not work.
I Hope this helps.