I also get "Windows Installer Service is busy configuring another problem" message when trying to install Microsoft Expression Studio 4.
I tried almost everything, sfc scan, register repair procedure, disable antivirus, restart Windows installer.
I searched across the net, nothing worked.
Is there any effective way except for reinstalling windows?
If the issue persists, try to perform a system refresh for test:
Win+C---settings---Change PC settings---General---Refresh your PC without affecting your files
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