Yesterday, I tried to jailbreak my Uk iphone. I followed every step shows on

My iphone was acitivated and I just wanna add some 3rd-party adds. on it then

1, I flash my iphone to 1.1.1 and use independece to make it works again (on mac)
2, i activated my iphone on itunes 7.5 (on pc)I can only active it on itunes 7.5
3, installed Oktoprep, then i restore my iphone to 1.1.2
4, i runned window-bat. it keep saying i hvnt install Oktoprep or hvnt conncet iphone

What's wrong with my precedure? Should I always keep iphone connected to my laptop? Should I use only one computer to finish all? Can iBrickr works well on itune 7.5?

im dying!!!!!!!! OMG ! I tried TWICE, it never changed.
somebody please HELP HELP!
Thanks in advance!