Sorry to hear you are experiencing problems with your device. If you have downloaded the latest version of PicoScope 6 you will already have the latest version of the driver installed. However if you wish to re-run the driver installer, you will find it in the following path:
C:\Program Files (x86)\Pico Technology\PicoScope6\system\DPInst.exe
Please refer to your support ticket for further assistance.
Technical Support Engineer