Valid digital signatures in Windows XP are no longer valid in Windows 7

We have a Windows application that uses axAcroPDF control to display digitally signed and validated forms. The PDF document was displayed correctly (Signed and all signatures are valid ) in Windows XP environment. However, recently our organization switched to Windows 7 machines. The digitally signed PDF documents no longer has valid signatures message. Instead the message "The certification/signature is still being validated" is displayed and it does not get validated. There is an exception "AcroRd32.exe:Access violation reading location 0x00000042"
Could someone help me to resolve this issue?
Thanks!

It is an ActiveX control provided by Adobe Acrobat (AxAcroPDFLib.AxAcroPDF) to host a PDF in a windows form application. We are using version 10.1.2.
Thanks!

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Acrobat is not validating digital signature

Hi Everybody...
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Thank you Bernd for your kind and simple reply
I am uploading my file with my certificate which i am using for my digital
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decoder etc......
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That suggests that the installer is getting damaged during the download.
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Sounds like your security settings for their site are missing - such as might happen when you delete temproary Internet files and cookies.
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Ram

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I am running Acrobat 8.
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Valid digital signatures in Windows XP are no longer valid in Windows 7

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