Adobe released...

Adobe Reader 8.1 for Vista

If you look at the Popular Content list in the left sidebar, you'll note that the version 8 release generated the most reads of any single blog post here. The reason? It was a bit flaky under Vista. Unfortunately, 8.1's Vista install is still an example of flakiness. Installing either as a normal user or as an administrator results in a complaint that Windows Explorer is running (duh!). It looks like selecting Ignore lets the installation proceed to completion. But, it is still an annoying experience.