Hello Jankes,
Before we go any further, is this wireless adapter the original one that came installed by factory? If so, we recommend that you contact your computer manufacturer first in order to obtain the latest drivers: http://www.intel.com/content/www/us/en/support/topics/OEMs.html Computer Manufacturer Support Websites
Secondly, you can try the following:
1. Go to Control Panel, Programs and Features and Uninstall "Intel® PROSet/Wireless Software", if it is installed. When prompted, choose the option to "Discard settings".
2. In Control Panel, Device Manager, Network Adapters, right click on the Intel® Dual Band Wireless-AC 7260 and Uninstall it. Make sure you mark the option to "Delete the driver software for this device".
3. Reboot the PC or scan for hardware changes, check device manager and if an older driver is detected and installed, repeat the actions to uninstall and delete it as well. Repeat this process until the OS does not allow deleting the driver, or until the controller shows as Unknown Device.
4. Reboot or scan for hardware changes, then uninstall and delete any older driver versions as you did for the Wireless adapter.
5. Install the Intel® Graphics driver downloaded before.
6. Install the Intel® Wireless driver. During the first steps of PROSet/Wireless installation, make sure to customize the installation and install all the 3 driver components
