I have upgraded to Windows 7 Home Basic and installed wampserver and then trying to install viart 4.07 over there, but everytime it stops at 55 or 56%. Any idea on what am I doing wrong?

Found the answer, Zend optimizer does not works with php version 5.3.3, working fine with version 5.3.0

4.0.7 doesn't require ZEND

then what could be the probable reason ???