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Sorry - I haven't used WAMP, only XAMPP, nor have I used Vista...
For what it's worth, the Windows event log should tell you something - right-click My Computer and select Manage. Under System, expand Event Viewer. The System log will tell you about any errors generated by services.
XAMPP has an option to run the servers as services - does WAMP?
Can you navigate the WAMP folders and launch the servers directly?
Are the processes listed in the Task Manager?