Parallel Port Monitor
Your Attention Please!
A bug was found in Parallel Port Monitor that caused the error "Unable to start the IO.SYS service" to occur on Windows 2000/XP machines. This bug has been found and was fixed on 08/06/02. If you are using an older version of the software, you will want to upgrade now!
The Parallel Port Monitor is a utility for viewing and manipulating the state of a parallel port on a Windows 95/98/ME/NT/2000 computer.