Hi Vik,
which dos version are you using? pc dos or ms dos?
I believe if you are using ms dos with latest himem.sys, it should not have this error.
also, if you can run mem program, it will show how much memory your machine can utilize.
even though you have a large physical memory, memory manager(himem.sys) might not handle correctly.
other thing you can try is get a hold of freedos himem.exe and replace it with current himem.sys
thanks.
regards,
James Lee