During the install of Patch 126.96.36.199, the module checklist may show that AntiVirus / AntiMalware "Version Installed" may be empty (blank).
The "Install?" check box is checked and you will see an error if you continue.
This is due to an unexpected issue identified with patch 188.8.131.52
SOLUTION / WORKAROUND
Un-check the "Install?" checkbox for this module and continue as normal. The module is installed, and does not require a reinstall.