tellyawhat: make a save with your gameshark to the usb drive of your system configuration file from youyr mc, and then stick the usb drive in your pc. you can post that here, and I can fix it for you, though I'll need the SCUS_123.45 ID from the psx "trigger" disc you want to use, or go to ps2savetools.com and download the ps2savebuilder, and do it yourself
hint: in case you dont know, click the save you made, and when the "windows cant open cause it doesnt know what prog made this" opens, select chhose from list, then use the browse box to browse to savebuilder, then those will always open with savebuilder, that"ll get you going.... obviously, then re-install that with the gameshark that made it.
if you have never booted anything with gameshark2, maybe your doing it wrong, read my old bit on that:
A toxic agent on a dangerous mission so secret, even I don't know what it is, because if I did, I would have to kill myself. I don't even know who's side I am on.