The latest Windows 7 update was installed on my PC on 12/03 (KB3032323, KB3033929, KB3036493, KB3035131, KB3030377, KB3039066, KB3046049, KB3033889, KB3035132, KB3034344, KB3032359). Since then my system is crashing every night at the exact time is schedule to run. Looking at the Windows Event Log I see that there are several error messages logged right prior to the crash saying "VDS Basic Provider - Unexpected failure. Error code: 490@01010004". I'm not sure if this message has anything to do with the problem but anyway I wanted to describe it here in case it helps.
Thanks for any help.
Milton