Dell PC with duel monitors getting screen remnants

I have a Dell PC running Windows 7 pro, and duel monitors that randomly gets screen remnants on the screed that stay and have to be refreshed to clear. I have updated the Dell BIOS and the Video drivers but the problem persists. not sure where to go next? See the attached file for the screen shot of the problem,Screen shot
PC info
Operating System      Microsoft Windows 7 Professional
OS Version      6.1.7601
System Type      x64-based PC
Service Pack      Service Pack 1
Serial Number      00371-OEM-8992671-00524
Installation Date      2014-05-16 09:21:50
Last Check Date      2018-03-19 00:46:29
COMPUTER SYSTEM
Type      Model      Time Zone      Last Check Date
Member Workstation      OptiPlex 9020      (UTC-08:00) Pacific Time (US & Canada)      2018-03-19 00:46:29
BIOS / BASEBOARD INFORMATION
BIOS Information      BaseBoard Information
Name      Manufacturer      Version      Serial No      Product      Manufacturer            Version      SystemModel      
BIOS Date: 05/23/17 22:16:25 Ver: A20.00      Dell Inc.      DELL - 1072009            0PC5F7      Dell Inc.      /FCDGK02/CN7220042M01EW/      A02      OptiPlex 9020      
HARDWARE PROCESSOR
Processor Type      Speed (MHz)      Number Of Processors      Processor Level      Last Check Date
Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz      3192      1      Intel Pentium Pro, II, III      2018-03-19 00:46:29
(Standard monitor types) ATI Radeon HD 3600 Series , LogMeIn Mirror Driver      1024x768
LOGICAL MEMORY
RAM      Last Check Date
15.9 GB
mspencer100Asked:
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Dr. KlahnPrincipal Software EngineerCommented:
I've encountered this in ATI Radeon video controllers that were (a) failing or (b) overclocked, either memory or shaders.  Given that the system has a Radeon 3600 (very surprising for an I5 system -- the HD3600 is very low end), I'd suspect the video controller and look at replacing it.

If you want to stay in the HD series the 6750 or 6770 are not expensive as used cards and most of them require no additional ATX power lines.  You may have to hunt around a bit to find a card that delivers dual connectors for whatever your monitors accept.  It's easy to find dual DVI cards but the video quality is inferior to HDMI.

There's a good selection of them on fleabay.

https://www.ebay.com/sch/Graphics-Video-Cards/27386/i.html?&mfe=search&_sop=15&_nkw=%28hd6750%2Chd6770%29
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Dr. KlahnPrincipal Software EngineerCommented:
Probable solution provided.  No further input from questioner.
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