uninstaller in use

i can't install some softwares, though i'm able to install some others.

i'm gettin

'setup has detected that uninstallshield is in use, please close uninstallshiled and restart setup.'

i can't figure out why am i gettin this error messare?
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deb007Connect With a Mentor Commented:
This could be happening if IsUninst.exe is corrupted on a particular machine. IsUninst.exe is the InstallShield uninstallation file, and when it's corrupted it might appear to be in use even though it's not showing up as a process that is running in Task Manager.

Delete all instances of IsUninst.exe from the %systemroot% directory and run setup again.
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