Did you reboot the computer after the roll-back?
Open control panel->Programs and Features
From the left column choose "View Installed Updates"
The Updates should be grouped by product and date
The bottom most group should be "Microsoft Windows" updates.
The bottom updates in this group should be the most recent updates that have been installed. Double check the far right column "Installed On" date to confirm the order.
Now assuming we still are associating your current issue with a Windows Update then you can choose to uninstall any of these by double clicking on them one at a time