Cross: MSDOS config.sys & autoexec.bat problem...

i added a network card to my mashine (working on MSDOS)

my config.sys:
DEVICE=C:\UTIL\HIMEM.SYS /M:4
DEVICE=C:\NET\IFSHLP.SYS
device=display.sys con=(ega,,1)
country=385,852,country.sys
install=mode.com con cp prepare=((852) ega.cpi)
install=mode.com con cp select=852
install=keyb.com yu,,keybrd2.sys
files=30
buffers=10

my autoexec.bat
mode con cp prepare=((852) ega.cpi)
mode con cp select=852
keyb.com yu,,keybrd2.sys
set clipper=f120
C:\NET\net initialize
C:\NET\nwlink
C:\NET\net start
C:\NET\net share



when i start any program i get the message "Program too big to fit in 
memory".
if i dont use net share function it works ok...
I think that it is a problem with HMA memory...
so my questiion is: Could i enlarge it? looks like 64k isnt enough...
any other ideas?

tnx in advance
p.s. sorry for crossposting...