This
may be the problem? IDT bought Sigma a while ago, and have rebadged their gear.Windows 7 is probably installing the wrong drivers, therefore.
It is a tricky one to resolve, but try this initially.
Download the Driver package - here
Driver Compaq Presario CQ61-132TU Notebook PC for Windows XP-Vista-7 | DriversTools
Unzip/extract it to a new folder on your computer.
Make sure you are diconnected from the Internet. Unplug if neccessary.Uninstall the IDT drivers.reboot, windows . Go back to the device manger, you may find it has reinstalled the same drivers. If so, uninstall them again, choose update and manually search on the computer. Point to your new folder - tick off the option to include sub folders - ...