Like so many times before. This one was caused by Zone alarm. It needs to be uninstalled and replaced by another AV/firewall like MSE, or ESET.
Let us know if you need help
Ken
Code:
Built by: 7600.16539.amd64fre.win7_gdr.100226-1909
Debug session time: Fri May 21 10:00:27.726 2010 (GMT-4)
System Uptime: 0 days 12:37:31.770
BugCheck 7F, {8, 80050033, 406f8, fffff80002c57e58}
*** WARNING: Unable to verify timestamp for vsdatant.sys
*** ERROR: Module load completed but symbols could not be loaded for vsdatant.sys
Probably caused by : NETIO.SYS ( NETIO!CompareSecurityContexts+6a )
BUGCHECK_STR: 0x7f_8
PROCESS_NAME: System