Error: InstallShield error code -6001 during setup. SUMMARY: During installation, you may receive an InstallShield error that returns an error code '-6001'. SOLUTION: This InstallShield error indicates a corrupt version of InstallShield is installed on your computer. To correct this issue, simply delete the following folder from your computer and attempt to run the installer again: C:Program FilesCommon FilesInstallShieldProfessionalRunTime701 If this fails to correct the problem, we recommend you RENAME (not delete) the entire C:Program FilesCommon FilesInstallShield folder and try again. You may rename the folder to anything you like, but we recommend something similar to 'InstallShield-old'.