Non usb vga monitor hangs after monitor sleeps - windows 7

Why does my non usb vga monitor (windows 7-64bit) hang when the monitors go to sleep? I hit space bar, escape - nothing monitor eventually comes on but suddenly flickering, loading in pieces to no avail - where I have to reboot the system to get both monitors to become live & normal again. What do I need to do?

I actually found a solution to my problem that worked after I posted my question.
It turns out confirming the display drivers are up to date and Nvidia drivers along with downloading the latest DisplayLink drivers for the adapter, available from http://displaylink.com/support/downlo

Did all of that, rebooted - set my power saving options to
turn off display - never and
put computer to sleep - 1 minute just to see what would happen.
Monitors went to sleep after 1 min. I tapped space bar and my system came back on as normal!

Hi Cee,

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Thanks!

Regards,
Roze