Defence+ and Linpack

I often use programs based on Intel Linpack (I have Windows XP SP3,2048MB Memory).Defence+ begining from version 3.8.xxxxxxxx doesn’t allow use more than 995MB RAM in tests (although the computer has free memory ).I tried to add Linpack to ‘trusted applications’,‘my own safe files’,but nothing changed.Linpack normally works,only if check on ’ Deactivate the Defence+ permanently’.Comodo version 3.5.xxxxxxxx always works correctly.What is the problem and how to fix it?