How do I eliminate this error?

Error always when I open any pdf file:
AcroRd32.exe - Application Error
The exception unknown software exception (0x0000409) ocurred in the application al location 0x0040122b.
Please, I have had this error since I installed the last version of Adobe Reader 11.0.3, to Windows XP - SP3 English, my system and I don't know to do to eliminate it.
Best regards,
Luis Ruiz

I've read several threads on this error at several support sites, including Microsoft, and the majority of them indicate this is caused by "malware". Either a trojan, or spyware, or an outright virus.
Have you run a comprehensive virus check on your system recently?

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