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I have developed a program in VB 6 that prints several invoices in pdf format.
The point is I cannot get the pdf writer to sign the pdf with the signature I want.
My global.ini file is shown below:

[PDF Printer]
;DisableOptionDialog=yes
;WipeMethod=3pass
;ShowSaveAS=always
;ShowSettings=never
SignCertificate=C:\certificate.pfx
SignPassword=password

Every time I open the pdf, Adobe doesn't recognize any signatures. I tried using bioPDF and bullPDF and none of them worked for me.
What am I doing wrong?

You are not doing anything wrong. Please read about the signature warning here:

http://www.biopdf.com/guide/pdf-certificates/

You need to configure your Adobe Reader to approve signatures that can be validated by Windows.

Regards,
Jacob

uhm... I did follow the page you showed me but.. even when I configure adobe to trust windows signatures I cannot get the printer to sign the files.
I realised that if I run manually pdfpowertool with some parameters I can get my pdf file signed, but I don't want to call the program every time I print pdf files.