I was directed to this forum from here.
I was initially infected with malware and would receive "Windows Explorer has stopped working" messages upon start up and couldn't enable my antivirus/firewall. These issues have stopped since the removal of the malware. However, I realised that if I tried to open my Control panel or Windows update now, I would receive messages such as "Windows Explorer has stopped working" or "Windows Explorer is restarting".
Any advise would be helpful and greatly appreciated!