Working on it.

I have been having a strange problem with my PC.

1/ On power up the audio turns on full volume.

2/ Windows update gets stuck.

3/ When opening file dialogs I get "Working on it" message forever but no list of files ever appears.

4/ Power down takes 5 minutes.

The problem occurs with all drives so its not a hard disc fault.

I have done a clean install of Windows.

I have put in new memory in case it was that.

Despite open file dialog just displaying "Working on it" I can open or save files by typing n their names in input box.

Yesterday I removed Norton anti virus and for a day now I haven't had any problems.

What is odd is it doesn't always have all these faults. Sometimes when I power up it is OK. It goes wrong about 50% of the time.

Any help or suggestions would be appreciated.

I am using Windows 10 pro with Skylake processor and 8gb ram.