please refer to email below:

From: Eric Armstrong <###@###.###>
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To: ###@###.###
Subject: Friendlier installation error
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Java WS installation failed a little while ago
with the error:
   "Unable to access c:\program files\Java Web Start\..."

I was mystified by that error, having no idea what
the problem might me.

It turned out that I had JWS running, at the time, and
I needed to close for the installation of the new
version to proceed.

But JWS needs to be downloaded and installed by
dummies (such as meself, at times). So it needs a
friendlier error message, such as:
    "Unable to install. Make sure no other versions
     are running. Otherwise, check directory permissions"