K-Jam, upgrade problem

Hi, I've been to the wiki page and downloaded the cid unlocker, T-Mobile rom, Lokiwiz and the Hornet 6.1 rom. I actually wanted a touch flo rom but every link seems to be dead. My ipl and spl are both 2.16.0001 so I have a G4. I have recently changed providers (I'm in New Zealand) so I take it my phone must be unlocked?
My problem is I'm using Windows 7 and so the windows mobile centre but when I use the "custom-ruu-wizard-1050412" program. I get part way through the installation and windows tells me the program has stopped working and recommends I close the program or check online and when I check online it just shuts down...help!!!

What am I doing wrong?

Cheers Matt

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