USB problems after Windows 8.1 update

Since I updated to windows 8.1 my USB ports have problems. The issues occur when I am trying to use a USB to serial cable. It will work for a short period of time and then stop. The error I get says connected device quit responding. Then it will start working again. Sometimes the system will crash and the error is that the driver unloaded before a que'd request was finished. When this happens, it takes about 5 minutes for the computer to come back up.
I had no such issues before the upgrade. Cisco anyconnect, VPN software no longer works either and I don't have the software myself as it was emotely downloaded by my company tech support, but any suggestion for fixing it would be appreciated as well.

The following document..
   Release Notes for Cisco AnyConnect Secure Mobility Client, Release 3.1
..contains this statement.
Note: When upgrading to Windows 8.1, uninstall AnyConnect, and reinstall it after your Windows upgrade is complete.
For help with this situation, post in the Cisco forums.
   Cisco Support Community
-Jerry

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