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		Guest
I have a Toshiba Satellite (laptop) with XP Home installed on it.  It did not work well, so I ran the backup disks today, and it seems more stable.  HOWEVER, whenever I try to install the upgrade to XP Professional I get the error message:  Setup failed to locate a valid qualifying product on your machine.  Then it gives me a drop down window to select the drive that the qualifying package is on (c, of course).  I select the C drive and get the error messate:  Error 1688.  Setup unable to locate qualifying product.  What am I doing wrong?  I have, indeed, registered everything with MS and with Toshiba, so what is the holdup?
				
			