At a client's site, after easily determining his bluetooth (wireless mouse & keyboard) problem was caused by driver conflicts, it took me a while going back and forth in Safe-Mode to learned that the culprit was the popular third party WidComm Bluetooth Software (the blue "B" icon). Uninstalled, and it works fine. Since I didn't have wire mouse or keyboard, and couldn't uninstall the program in Safe-Mode, I managed to uninstall the pertaining driver "Bluetooth Devices" in Device Manager.
Then it was the network problem. I was trying to share printer and the error: "Logon failure: user account restriction. Possible reasons are blank passwords not allowed, logon hour restrictions, or a policy restriction has been enforced." popped up. Fix: (Since it is due to blank passwords) Go to Control Panel->Administrative Tools->Local Security Policy->Local Policies->Security Options-> and Disable "Accounts: Limit local account use of blank passwords to console logon only"
The other fixes were easy. And I'm done. My favourite client. He owns a Saloon called at upper east side. He even offered to cut my hair. Since he's Jewish, the name Zohan kept running across my head when I reached his shop.