Office 365 does not open .doc or .xls files

I recently purchased Office 365 and all was working fine for a couple of months.  I therefore decided to remove my old office software from my PC which I purchased years ago.  Now office 365 does not open the old file extensions of my filed documents even though I checked the defaults of all file extensions it does not reacted to a request to open .doc or .xls files.

Can anyone help me sort this out.

Andy