Hi,
> full path to the installation of WampServer (eg D:\wamp\): C:\wamp643\
Are you sure that only one version of Wampserver is installed on your system?
The content of the "InstallLocation" key in the registry for
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{wampserver64}_is1
must be c:\wamp643\
If this is the case, proceed as follows:
Delete all files into : c:\wamp643\logs\
Delete all files into : c:\wamp643\tmp\
before launching Wampserver.
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Wampserver install files & addons