I know that this has been covered, but I just wanted to reiterate so updaters don't thrash around like I did trying to get this thing done:
Before you even think about updating to ICS:
For all Windows machines, but especially for the Windows 7 X64 based, make absolutely sure that you have the latest "JAVA UPDATES"
If you use the AIO to reset your system location to the USA, have the right java drivers installed, and follow condi's instructions one by one... the entire update w/root is a total breeze. Seriously, easy as pie.
FYI: After the update, you can turn off the residual Sony update messages by using the AIO again. Go to "Tweaks and Mods, then #3, that will toggle the pesky update messages to "OFF".
Thank you condi for your tremendous work!