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Launch Task Manager. If there are TWO instances of msiexec.exe running, end one of them.
That is the quickest way to see if the install will complete.
If that doesn't work, Download, install, and run this Microsoft utility to clear up the installation in progress
http://support.microsoft.com/?kbid=290301
after reading these directions
http://iancooper.spaces.live.com/blog/cns!844BD2811F9ABE9C!132.entry
And it possibly could get fixed by these steps
http://support.microsoft.com/kb/315353
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