This Error has appeared on sites where Kaspersky is the Antivirus and an upgrade is done. If Kaspersky has updated you will need to do the same process again.
To resolve - disable Kaspersky, upgrade and then turn it on again. Disable on workstation installs as well.
Kaspersky is not recommended for use with Infusion as it causes a number of conflicts - we recommend Nod32 or TrendMicro.