I have spoken with Microsoft and they suggested it may be the following problem. I'm applying the fix, we'll see...
If you see these symptoms (sluggish performance, no internet, MMC not responsive )after a reboot, ask if they are running Powerchute. If they are, ask if it’s version 6.x and you can point them here to get it fixed: http://nam-en.apc.com/cgi-bin/nam_en.cfg/php/enduser/std_adp.php?p_sid=1qAKEFMh&p_lva=6238&p_faqid=7202&p_created=1119891241&p_sp=cF9zcmNoPSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9NDk1JnBfcGFnZT0x&p_li
What’s the problem? There’s a certificate for the java that drives PowerChute that expired on July 27th. The computer will continue to run with the expired certificate until it is rebooted, like after applying patch MS05-039. After that, APC is bonked, and nothing runs right on the system. Customers will believe they have been compromised.