Netware5 – Win 2000 clients prob. with I

Any information on why when logging onto a Netware server with a Windows 2000 client does the client machine continue to reboot after making the connection to the permitted Netware servers. IPX/SPX is installed on the client machine. If IPX/SPX is disabled the machine will connect to the Netware network with no problems. Because of some of the legacy applications used on the network IPX/SPX is required. 95 / 98 /NT 4 clients are not having this problem. Please help solve this problem. Thanks JLM