Nik 4 not installing

Something on my PC is stopping Nik4 from installing, but I have no problems with Nik3. When I start the install I select my language and then next screen comes up and freezes.

On a Windows.10 PC? Which language? Is it the latest Nik Collection 4.0.8? Have you checked to see if antivirus software might be interfering?

Thanks. I have tried English and US English. Win 10 updated. Latest Nik 4 from DxO website. I have immobilized Norton , but not defender. I even used Revo uninstaller to remove other DxO software, nothing. But I could reload Nik 3. Nik 4 loaded on to my new lap top. Thanks