Actually... The problem came back...

I tried to connect as "sa" through SSMS and that seemed fine.

I had renamed my PC and my login in SQL Server was still referring to the old name.
SSMS refused to create a new login for me saying it already existed.

So I removed my windows login from SQL server, recreated it with the right machine name and everything seems fine now.

Thanks for trying to help (as always).
It is much appreciated

Eric