[Dx4win] DX4WIN crashes

[Endorf Family]

Help,
I have been running DX4WIN V5.03 for long time on a Pentium with 128Mb RAM.
I just loaded N1MM software and MMTTY software. Many other programs
including these two new ones have been running, and continue to run fine.
However now when I launch DX4WIN, I get a system memory error, as soon as I
try to do anything.
What is the minimum memory requirements of DX4WIN?
Something else I am missing?
I did a DX4WIN re-install.
I removed, cleaned, reshuffled, and reseated the memory SIMMS.
Any ideas, direct them to me.
THANKS!

Mark WA0MHJ