Beta worked ok for three days but taking system back uninstalled beta and icons all returned. There may be a problem with Beta.
Sounds like you installed the Windows 7 SP1 Beta package. If I were you I would leave it off until the final release comes out sometime this fall, probably late October.
That's the problem with anything "beta", still unresolved issues and potential problems.
Not W7 SP1 Beta installed but W Live mail beta. Removing it seems to have done the trick.