Error with CS5
When I try to clear the cache and follow your instructions I see that there are three sets of Dreamweaver in the appdata section. Dreamweaver, Dreamweaver cs4, and Dreamweaver cs5.
There are no DATA nor keys under Dreamweaver, There was an older wincache under Dreamweaver CS4 (I upgraded from that and Adobe did not delete the old keys and data), and Dreamweaver CS5 has no wincache but it does have a siteCache.