D7 installation couldn't start

Enter http:\\www.mysite.com\Dolphin\install\index.php

show D7 installation main page, but click INSTALL didn't start the installation process,

but stayed at installation page. The status bar show Done.

D7 files all located at \Dolphin;

D6 files were deleted.

Any suggestions?

Thanks.

Fixed the problem by restoring the original php.ini file, not sure which setting caused this issue.