ATIH11 all usb drives inaccessable

Win 7 x64, Gigabit GA-P55A-UD6, Intl i7 860, Gskill 8GB
After 6 weeks of working with Support, finally got ATIH11 installed and working, (kept seeing a corrupt previous version, then BSOD on boot) but now all USB hard drives and memory sticks are not accessable from Windows. Other USB devices working okay, even a WD Passport with a virtual CD drive works okay, but not the hard drive volume. Devices are seen in Device Manager with exclamation marks, driver reinstall fails with unexpected error.

Have restored (from backup) all drivers starting with usb, disk.sys & partmgr.sys. The only drivers left are Acronis' snapman.sys and tdrpm273.sys.

I'm reluctanat to uninstall/reinstall ATIH11 & ADD11 given my past experience of getting the apps working. Sure wish I didn't upgrade from ATIH10!