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SBAMSvc crashes and apparently causes "logon process has failed ..." problem

I'm running what was a very stable copy of Vista SP1. I believe that the most recent update of Vipre has made my system unstable. The problem exhibits itself when I use a full screen application (such as a game or WebEx). At some point before the serious issues erupt, the event logs show an entry: "Faulting application SBAMSvc.exe, version 3.1.2710.0 [...] faulting module ntdll.dll [...] fault offset 0x000659c3 [...]." Sometime after that fault, when I attempt to return to windowed mode (from a full screen game, for example) is when havoc ensues. (Note it's very very VERY slow havoc.) Essentially the system appears unable to return to windowed mode; for example, the event log shows multiple entries (after the SBAMsvc fault) from Winsrv "... terminated because it was hung: explorer.exe." Ten minutes of impatience later, pressing Ctrl/Alt/Del produces (after a significant delay) "logon process has failed to create the security option dialog." Much web searching reveals that this is Vista UAC's close cousin to the classic BSoD. It appears it is often created by issues with security software, which is why I'm thinking Vipre may be related. I'm the first to admit that Vista systems are complex and that some interactions other than with Vipre may be at fault here. One thing of which I am absolutely certain: this *never* happened before the most recent update of Vipre and Vipre is the *only* thing that's been updated recently. I've scoured all logs and have not applied any other system updates since the Mar 12 patches. The only thing to change since Mar 12 is the Vipre update. (I certainly have not installed IE8!) Since the prior Vipre major update, I've been very happy with the product. What more information do you need from me? I hate to run without AV/AS software, so de-installing Vipre and running without it means to me I need to replace it with something. Is there a way I can return to the prior version of Vipre? The only way I can recover from this mess, by the way, is a hard power-down. Very icky.
 
indifferent I’m very concerned
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