I have seen this before. Some anti virus program removes part of installed files (like uninstall.exe) which makes the uninstall not removing cleanly. This might require manual cleanup (like deleting the old install files/registry) to fix.
While installing USM, it show remove the previous version. Checked, have removed from add/remove program. [IMAGE]  Receiving following error [IMAGE] [IMAGE]
Fail to re-install USM with fatal error receive.