Exchange 2000 system error 128 and services stopping

I gotta serious problem with my Exchange 2000 Server that maybe someone
shed some light on.
 
But first the specs...I am running a single Exchange 2000 Server with
Exchange SP3 on Windows 2000 SP4 (All latest post SP4 hotfixes) on a DELL
2400 server running RAID 1, 1.5 Gb RAM
 
3rd Party Software running:
MaxCompression email attachement compression software
GFIMail Essentials Anti-SPAM Software
Trendmicro Interscan Anti-virus software
 
Now the problem:
 
Part A
 
Server ramdomly re-boots  (on average once every 4 or 5 days) after the
following msg appears on the screen:
"c:\winnt\services.exe has encountered system error 128 and will restart
in 60 seconds"
Have scanned the machine for viruses and trojans but all clean.
 
Part B
 
Following services randomly stop ( on average once every 2-3 days) but all
these services stop together.
 
NNTP
Exchange Routing Service
SMTP
WWW
IIS Admin
IMAP4
Has anyone got any ideas?

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