Id start with ensuring that the PCs HW drivers are up to date, i.e. USB if any.
Disable any 3rd party security SW while uninstalling and re-installing.
If your using 7x64, do a reboot of the PC and hit F8 on pre-boot to get to the dos window selection and find Disable Driver Enforcement, select this and then continue. Then try to install the DWA drivers from scratch using the ones from the web then when directed, plug in the DWA, try different ports.
Only other think you can try is a different USB adapter PCI card in the PC.
Do other USB devices work on the current USB ports?