hey guy! if you don't familiar with subject, don't give any advices
sijan, it seems some file is missing or apache core cannot find it
it's enough only 3 files for running php as apache module:
php4apache.dll
php4ts.dll
php.ini
php.exe is optional - for running your php scripts from command string only.
so make sure apache can find php4ts.dll - it's the php core engine - put it either to apache directory, or windows system directory, or directory where php4apache.dll reside.
also try to exclude loading of any libraries from your php.ini file
anyway, feel free to e-mail me. please let me know, did it help you or not.