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We are also experiencing error to AutoCAD LT 2011, "Fatal Error: Unhandled Access Violation Reading 0x0000 Exception at b1aca5h".
For your assistance.
I was datamining our cases and it can either be a .NET installation issue or if it is not there, get a copy from another computer and then register it by doing the following:
C:\WINDOWS\System32\prntvpt.dll