MX-C250, MX-C250E, MX-C250F, MX-C250FE, MX-C250FR, MX-C300F, MX-C300W, MX-C300WE, MX-C300A, MX-C300WR (serv.man13). Software Set-up Guide - Sharp Copying Equipment User Guide / Operation Manual. Page 42

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WHEN INSTALLATION WAS NOT SUCCESSFUL
The printer driver cannot be installed (Windows XP/Server 2003)
If the printer driver cannot be installed on Windows XP/Server 2003, follow the steps below to check your computer 
settings.
1
Click the [start] button and then click 
[Control Panel].
2
Click [Performance and Maintenance] 
and then [System].
3
Click the [Hardware] tab and then the 
[Driver Signing] button.
4
Check the settings in "What action do 
you want Windows to take?"
If [Block] is selected, the printer driver cannot be installed. 
Select [Warn] and install the printer driver again.
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