how did you upgrade...
if you installed with just the executable, and copied it over top of you older php version it is out of synch with the .dll files
you have to download the zip file, unzip it and copy the whole beast over, just so that your .dll files will work with the php.exe...
then go into your php.ini and make sure that the sockets .dll file is uncommented, then make sure the php extensions directory in there is set correctly
on the php website it says "This extension has no configuration directives defined in php.ini"
but this is a damned dirty lie....
im assuming that on windowsn with pache 2 you are calling php as a cgi and not as an apache extension also...
does any of this help