Procedure to Upgrade Win2k SP4 to IPv6 Capable *Note this may break your box, use this for testing only* Download the developer preview from the following URL: http://msdn.microsoft.com/downloads/sdks/platform/tpipv6/download.asp Extract the files to a directory on your local machine using "setup.exe -x" Edit the [version] section of the Hotfix, change the line NTServicePackVersion=256 to NTServicePackVersion=1024 Run Hotfix.exe At this point you should have ipv6 working using the ping6 tool however IE 6.0 will not work due to issues with the "wininet.dll" file. In order to get IE to work you need to reboot into "safe mode" and manually copy over the wininet.dll file in the C:\WINNT\SYSTEM32 directory with the version that came with the v6 tech preview. Be sure to rename the old version first. I have no idea what this may break so use at your own risk. It does get IE working though, just be sure you are getting AAAA records from your DNS server (over IPv4).