That fix is not for the Service Pack 2 Windows XP.
I hate this behavior of Sony, man ... it's unbelibable.
Kintaro, i have the same problem, and i have the solution.
Backup your major files and docs, then format the PC and install a fresh windows, next make some updates but not that crazy one (i don't remember the name), try the sonic stage, it works for me. But if you install the SP2 the sonic stage stops working that for sure.
The decision is yours.
I prefer more safety on my PC.
Those bastards of Sony shoud had done the homework, before this shit.