It is simply not a good thing when your Anti-Virus starts listing off system files and says they are quarantined. It can really ruin your day.
According to posts at CA's Forum many people were receiving these false positives and causing systems to crash.
File infection: C:\WINDOWS\system32\net.exe is Win32/AMalum.ZZNPB infection. Quarantined
CA users we certainly upset and were told that a fix was on its way when they contacted technical support. Unfortunately the "fix seemed to make things worse.
CA has posted an official statement apologizing for the incident and says that they are working to fix the issue caused by an errant file.

CA's statement can be found here