new computer/old monitor - garbled display

I replaced by 486/WIN 3.1 Packard Bell PC with a custom build CyrixInstead 32Mg RAM WIN 95.  I plugged the Packard Bell 1511SL monitor in and get text that is occaisionally garbled.  If I highlight the text, it becomes visible and readable, but without highlight - I get either black bars or what looks like UPC code bars across text.  

If I pull up text and get some of this, then save and redisplay, these baars/UPC code looking things move.

Do I need to install a specific driver for the montior or what?  It's a nice 15 inch, so I don't want to replace it.
pittisingAsked:
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tstaddonConnect With a Mentor Commented:
This is a problem with the standard graphics driver, not the monitor. You are trying to run your monitor in a mode which is not supported. Try setting the monitor as a 1511SL (if you have Windows 95 OSR2 it is a standard monitor type) or as a standard SuperVGA monitor if it isn't. If you get the problem in 800x600 mode but not 640x480, your monitor may not necessarily support the refresh rates that your current monitor settings are using.

I had the same problems with Japanese Windows 95 running on English PCs, and it was fixed when I downloaded the updated driver from the manufacturer.
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