I forgot that you may have to update Snow Leopard. 10.6.6 is required for xMove isn't it? Well I know what happened. You need to multibeast much like what you end up doing with Lion. You're probably going to have to reinstall Snow Leopard I'm afraid. I'm sorry but I haven't had to install Snow in a long long time.
I kinda wish you had messaged me before you updated haha well anyway.
Reinstall Snow. Download the combo update from here and save a copy on a flash drive. In case we have to reinstall again.
http://support.apple.com/kb/DL1349
Install it but DO NOT REBOOT, much like what you see at the end of the tutorial. Just leave the "You need to reboot"(paraphrasing...) window up and do the following.
Now you need multibeast for Snow.
Here's the handy dandy link for that.
http://www.tonymacx86.com/viewforum.php?f=125
In Multibeast you need to do the Easybeast install, Chameleon, and Repair Permissions.
Then you
should be able to reboot correctly.
Chameleon is one of the boot loaders so you won't have to boot from a disc.
The reason the update nuked your install is because if Apple's updates replace the files that the OSX86 community has replaced to make the computer run on non-Apple hardware then you need to put them back. iBoot is only really meant to boot that retail disc and a completely vanilla install. You need to run Easybeast to make it non-Apple hardware friendly. I'm fairly certain this is our problem.