They are usually out of date. Check if there are newer drivers at the maker's web site.
I bought USB Dual Band adapter from USB Novel so I could pick up the 5G band on an older laptop. It is an Ausus 733 with Windows 7. The driver will install from the disc they provided. I will get the icon. I click on the icon. I insert the adapter. It blinks blue as it is supposed to. The window for the adapter opens up and I can see the adapter on the left side, It is blinking under My Computer, but there is nothing on the right side of the page (it should be a series of tabs, including a search for networks). IT continues to blink. If I open the Network Connections page, it shows as it being DISABLED. I right click on it and click ENABLE, but it will not enable. Sometimes the icon near the clock will show as 5 bars instead of an icon, but it is greyed out. If I mouse over the icon near the clock, it says it is disconnected. I have tried DISABLE on my internal card. I have tried rebooting. I have been doing this for three days now and it will not work. There must be some setting that I am missing. It wasn't expensive, but it got pretty good reviews.