CIS causes BSOD

I’m running WinXP SP3 Home edition and CIS 3.5.57173.439. Several minutes ago I was confronted with a BSOD that carried the following message:

Problem seems to be caused by cmdguard.sys
Address F5837DA5 base at F582C000, DateStamp 493590aa

It has literally been years since my last BSOD, and I’m pretty freaked out. What is going on here?

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