Hi Pagkalis,
As I informed you earlier that there can be compatibility issues of the Windows 7 drivers with Windows 8.1 as it is a preview version. Also, what you can try doing is installing the drivers compatible to Windows 8 or installing Windows 7 drivers in compatibility mode. Here are the steps:
- Download the driver from the Link shared above and double click on the file and extract it on the desktop in a folder.
- Look for setup file in the extracted folder.
- Right click ‘.exe’ file and click ‘Properties’.
- Click “install in compatibility mode’.
- Click on Application and select ‘Troubleshoot Compatibility’.
- Next, click on ‘Troubleshoot Program’.
- Click on Program worked in earlier versions of Windows.
- Click on ‘Windows 7’.
- Click on ‘Start the Program’.
- Do not hit ‘Next’ until the installation completes.
- Once the installation completes, click on ‘Next’.
Hope this helps. Please reply if you have any questions.