the current versions of wamp are not upgradeable. if you want to upgrade, backup all your website data, uninstall wamp, delete the c:\wamp folder, restart pc, install the latest wamp.
CyberSpatium
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WAMP English Forum Admin
I have WAMP5 working with (for development use only):
Windows Vista Ultimate x64 (64 bit)
Kaspersky Internet Security Suite 7.0.x
Spyware Terminater 2.
Forum:
WampServer English