I have wamp 1.7.0 on my both Vista Premium and Business for almost a month, and before I've had older version on XP for about a year and so far I've never encountered that problem yet even I'm trying a lot of different cms such as joomla, php nuke, wiki, shopping cart, so on and they're all use mysql db.
So I wonder if you try different app to see if still have the same problem?
Have fun,
[www.jlbn.com] (testing WAMPS on Vista)[test.jlbn.com] (testing codes on Vista)Win Vista Business
Apache
2.2.4MySQL
5.2.3 F-APHP
5.2.1SSL
0.9.8DphpMyAdmin
2.10.0.2