See if this will work
Right-click on the Desktop -> click Refresh
[FONT=Arial, Helvetica Neue, Helvetica, sans-serif]reboot[/FONT]explorer.exe
Jusy in case:
To reboot explorer.
Right click the task bar and select task manager.
Under the "processes" tab, scroll down to Windows explorer
Right click it and restart.
There will be a temporary loss of screen - only about a second, or less, the screen should then be saved.
An alternative is to open the Windows explorer, under "Users" - username, you will see the item "desktop"
Right click it drag it to a safe place and selct the option to copy it there.
Now, if ever you lose the positions, after updates etc, you can reverse this and drag it back again. Just remember, if you do this, it will return the desktop as it was...