Thanks, Phil22,
This is not a persistent problem, it comes and goes. For ex. this morning it is not doing it. So it is either associated with dates or when something else is running in the background (a mild virus?).
I tried to download sound drivers before, but each time I ended up with pay requests, so I got suspicious.
I'll try your suggestion and will get back to you if it worked.
Thanks a lot,
Janos
Toronto, Canada