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Scanjet 3300c was working perfectly until I installed my Epson stylus Photo 750 USB printer. <br />
After the printer got installed I get the following messages when I try to open the HP precision scan LT software:<br />
<br />
Window #1 <br />
Error starting program<br />
HPPRSCLT.EXE file is linked to missing export MFC42.DLL:6571<br />
<br />
Window#2header: &nbsp; &nbsp;C:/&quot;path&quot;/HPPRSCLT.exe<br />
A device attached to the system is not functioning<br />
<br />
Pressing the scan or copy button on the scanner produces the following message:<br />
The application associated with this event could not be launched. Make sure application is available and functioning<br />
<br />
I uninstalled the program and reinstalled... no go!<br />
I removed the printer USB cable and tried ... no go!<br />
<br />
PLEASE help
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Scanjet 3300c was working perfectly until I installed my Epson stylus Photo 750 USB printer. 
After the printer got installed I get the following messages when I try to open the HP precision scan LT software:

Window #1 
Error starting program
HPPRSCLT.EXE file is linked to missing export MFC42.DLL:6571

Window#2header:    C:/"path"/HPPRSCLT.exe
A device attached to the system is not functioning

Pressing the scan or copy button on the scanner produces the following message:
The application associated with this event could not be launched. Make sure application is available and functioning

I uninstalled the program and reinstalled... no go!
I removed the printer USB cable and tried ... no go!

PLEASE help

Error Starting Program window

A peripheral device is defined as a computer device, such as a keyboard or printer, that is not part of the essential computer (i.e., the memory and microprocessor). These auxiliary devices are intended to be connected to the computer and used in conjunction with it. Examples of external peripherals include mouse, keyboard, printer, monitor, external Zip drive or scanner, while internal peripherals include CD-ROM drive, CD-R drive or internal modem. Today's new devices, such as tablets, smartphones and wearable computing devices are considered peripherals as they can be connected and used on a computer system. The difference, however, is that these devices can run independently of the computer system.