ACT - attempted to read or write protected memory

Hello Experts
I have ACT installed on one of XP machine on the network. I am trying to use Mail Merge option, after selecting the email type, template name , group name etc  when I click on Finish.

Instead of sending emails through I am getting this error

Attempted to read or write protected memory. This is often an indication that memory is corrupt.

Please can  someone advise why I am getting this error? It use to work fine before.

Who is Participating?
Mike LazarusAct! Evangelist - CRM ConsultantCommented:
It means there is some Microsoft damage.

Try the fixes listed at this page:
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