Dreamweaver and Pure Asp Upload

I am using Pure ASP Upload 3 and have a site which has used this successfully for some time.
Recently the web page which uploads the image has failed several times with an error
"Server Application Unavailable
The web application you are attempting to access on this web server is currently unavailable.  Please hit the "Refresh" button in your web browser to retry your request."
I find if I restart the server the page works again.

In Dreamweaver I looked at the page concerned and find that the extension Pure asp uload 3 is missing.
If I try to reinstall Pure Asp Upload 3 I get an error
Unable to open script file "D:\Program Files\Adobe\Adobe dreamweaver CS3aConfiguration\Shared\DMXZone\Scripts\Forms\progressFilesMenu.js

Can you say from the above what needs to be done to sort the problem out please.
Many thanks
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johnhardyConnect With a Mentor Author Commented:
Thanks manavsi
The problem was caused by having two versions of asp.net in the same application pool. I created an additional pool and specifying version 2 for that domain.

I also found a way of re installing the Dreamweaver extension.

So there were two problems!
manavsiConnect With a Mentor Commented:
That Server Application Unavailable is a Bug in Microsoft.. Use the latest security fix:

Download: http://support.microsoft.com/default.aspx?kbid=827641
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