You are trying to install something on your Windows XP / Vista and the istallation stops with the messages Another installation is already in progress…
If you do not have any installation in progress you cold try to run regedit and look in:
HKEY_Local_Machine\Software\Microsoft\Windows\CurrentVersion\Installer
Look for folders named
InProgress
Rollback
Temp….
Remember to make a backup of the registry before making any changes.
You could try to remove this folders as the Installer looks for this to determine if another installation is in progress.
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