Netware 5.1 & ArcserveIT 6.6 Loading

I am having problems getting ArcserveIT 6.6 to run on my Netware 5.1 Server. The CSloader
hangs during the load of ASDB.NLM with a failed to load message. If I quit the CSloader and wait the system console says that the ASDB.NLM has loaded. Re running ASTART6 will then complete the process and ARCSERVE is loaded. The whole process takes about 30mins, and causes a slow down from which the serve does not recover unless it is rebooted. I have changed the version of NWASPI,CDM to v2.00 ay CAI’s suggestion. Any ideas?