Windows API error 87: The parameter is incorrect

Hello,

I've just installed MikTex 2.9. I am trying to typeset a file with many
package dependencies.
In the past, MiKTeX would simply prompt me to download any required
packages and they would install without issue.

In this new install of MiKTeX, the package installations fail with
error: *"Unfortunately,
the package colortbl could not be installed.Please check the log file:*
*C:/Users/USERNAME/AppData/Local/MiKTeX/2.9/miktex/log/miktex-pdftex.log"*

 The log file contains the line:
*"FATAL miktex-pdftex - Windows API error 87: The parameter is incorrect."*

This appears to be happening because TeXworks is open. If I close TeXworks
and use MiKTeX package manager, I can install whichever packages I like.

However, it is very frustrating to constantly open and close TeXworks so
that I can install dependencies one at a time.
Does anyone know the solution to this issue?

Thanks,
Barry
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