" The Ordinal 422 could not be located in the dynamic link library PX.dll "

Just got this error... so a quick search tells me...

To resolve this error, uninstall Winamp. You do not need to reboot before proceeding. Reinstall Winamp, but make sure to uncheck the "Audio File Support --> Sonic Ripping/Burning support" option on the "Choose Components" panel of Winamp Setup. You probably will not need to reboot again, and Winamp should now start up without the error message.

source: http://www.somacon.com/p101.php