Problems with installation of php4

Hi I just tried to install php4 on my computer, but I can not load the extention libraries. When I uncomment some libraryname in php.ini file the server gives me such error "Invalid Library (mayby not a PHP library) 'php_dbase.dll' " What can couse this problem? I cannot exchange the DLL-file msvcrt.dll in Winnt\system32 directory, because there is just Win2000 on that computer and this dll is loaded into memory at start of system. Can this be the cause of my problem? What can I do to correct it? Thanx in advance, Yurij Nykon