Blue Screen of Death - Stop c00021a {Fatal System Error}

Hello Sm, I apologize for the inconvenience caused. You can find answer to your question together with your another post here.
https://support.avg.com/answers?id=906b0000000DK5p

Please try keep whole conversation in one question/thread to speed up resolution.

What is going on with AVG 2015 FREE?  I posted a comment to this same topic, but felt I should post this question too.  I have received the BSOD three times today while attempting to run a scan.  I deleted AVG 2015 FREE, downloaded the latest version, installed it, and tried again – same results:
"Stop: c00021a {Fatal System Error}  The Windows Logon Process System progress terminated unexpectedly with a status of 0x00000000   0x00000000  The System  has been shut down."
Please, please help!  I've tried everything I know to do to remedy the situation – to no avail.  My OS is Windows XP SP3 and my computer is a Dell – heretofore I have not had any problems.

Hello Sm, I apologize for the inconvenience caused. You can find answer to your question together with your another post here.
https://support.avg.com/answers?id=906b0000000DK5p

Please try keep whole conversation in one question/thread to speed up resolution.