Hi,
See item 9 of
TROUBLESHOOTING TIPSThe first lines of httpd-vhosts.conf must be :
# Virtual Hosts
#
<VirtualHost _default_:80>
ServerName localhost
DocumentRoot "${INSTALL_DIR}/www"
<Directory "${INSTALL_DIR}/www/">
Options +Indexes +Includes +FollowSymLinks +MultiViews
AllowOverride All
Require local
</Directory>
</VirtualHost>
#Try to use the PHP version used before.
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Wampserver install files & addons