Da vinci resolve can't open

Hi
I used the free version of resolve 14 ( latest update) without problem.
I just bought the studio version with the dongle.
The software loaded once without problem but now it is crashing all the time and can't open it.
Everything goes normal until the monitor
I tried to reinstall. no success
here is my set up
Windows 10
i7 6700K CPU 4ghz
ram 32 gig
Nvidia Geforce GTX970
driver nvidia: 24.21.13.9811
The error is in french but free translation.
Here is the error I c an see: resolve.exe (PID:14228) Fil: 2200 resolve waits the end of network operation ( opération E/S reseau)
I used the free version of resolve 14 ( latest update) without problem.
I just bought the studio version with the dongle.
The software loaded once without problem but now it is crashing all the time and can't open it.
Everything goes normal until the monitor
I tried to reinstall. no success
here is my set up
Windows 10
i7 6700K CPU 4ghz
ram 32 gig
Nvidia Geforce GTX970
driver nvidia: 24.21.13.9811
The error is in french but free translation.
Here is the error I c an see: resolve.exe (PID:14228) Fil: 2200 resolve waits the end of network operation ( opération E/S reseau)