For whatever reason I lost all of the “Favorites” on my email account. My alternate accounts are still intact. Any way to recover?

When I signed on to my email account this morning, all of the favorites were gone.  The only unusual event that I can think of

is that when I went to shut the computer off last night, I receive the message regarding a "windows critical update".  I tried

called because I have an MSN Premium acct., but no one there seemed to be able to help,  I have had very good service in

the past, but this appears to be too much of a challenge.  It's hard to believe that it is not somewhere on the hard drive.