No Preview in PE 2020

I can't see a preview and would appreciate all ideas re: a solution.  I tried updating the graphics card driver and disabling the hardware acceleration, as indicated in similar posts on this forum, but still have no preview showing.  The audio is fine.  My system info is:

OS Name Microsoft Windows 10 Pro
Version 10.0.10586 Build 10586
System Manufacturer HP-Pavilion
System Type x64-based PC
Processor AMD Phenom(tm) 9650 Quad-Core Processor, 2300 Mhz, 4 Core(s), 4 Logical Processor(s)
BIOS Version/Date Phoenix Technologies, LTD 5.14, 6/20/2008
Installed Physical Memory (RAM) 7.00 GB
Total Physical Memory 6.87 GB
Available Physical Memory 4.22 GB
Total Virtual Memory 8.00 GB
Available Virtual Memory 4.95 GB
THANKS!!!