Win7 64-bit logs you on with a "temporary profile" --- SOLVED THIS TWO DIFFERENT WAYS: On one laptop, I just did a system restore to a point that had been created about 6 hours previously. So far, that has worked with no reoccurrence. Then today I began experiencing the same totally aggravating behavior at logon with a different laptop, which did not have a convenient restore point. So I booted up in Safe Mode with networking and ran system tools (disk defrag, disk cleanup, registry cleanup and registry defrag). Then I shut down...waited....and powered back up and who-la hooray --- my profile is back! Hope this helps and works for everyone else.