Bug in PHP

Dear Sir, I am PhP programmer and have encountered the following error quite often: PHP has encountered an Access Violation at 77FCBAAC What could be causimg this errors? I have just installed the version 4.3 pre 1 after encountering the samen problems with the version 4.2.3. I have already reinstalled the PHP with the isapi DLL , copied the php4ts.DLL to the directory System32 of WIN2K in the server IIS5 , pointed the IIS5 isapi filters to PHPISAP.DLL and utilized as php.ini the file php.ini-dist None of these alterations improved these errors. Please advise me ASAP of what else I can do to solve this out. Thank you very much, Best Regards -- Domingos Teruel Desenvolvimento Fik Online Operadora de Sistemas Ltda. Av. Ipiranga 1100 Cj 90 Centro 01040-904 São Paulo SP Brasil Fone: +55 11 3328-4200 Fax: +55 11 3328-4200 E-mail: domingos@efik.com.br <mail:domingos@efik.com.br> Web: www.efik.com.br <http://www.efik.com.br> ICQ: 93544394