Hi, Im currenty  developing a MSI InstallScript Setup. To avoid most of the problems associated with MSI, I'm only using MajorUpgrades as the upgrading procedure with RemoveExistingProduct running before InstallInitialize to have a clean environment everytime. RemoveExistingProducts however only removes ...\Uninstall\{ProductCode} registry key from the System and leaves the \Uninstall\Installshield_{ProductCode} key.  Because of this, a broken Link remains in the Add/Remove Programms DIalog in the Control Panel So far I've checked following: Running everything with Admin rights Advise from KB in: https://community.flexera.com/t5/InstallShield-Knowledge-Base/Major-upgrade-leaves-2-entries-in-Programs-and-Features/ta-p/4325 Actions and Custom Actions all return 0 or 1 All Features and Components are marked for removal in InstallValidate MSI (s) (xx:xx) [xx:xx:xx:xxx]: Feature: feature1; Installed: Local; Request: Absent; Action: Absent MSI (s) (xx:xx) [xx:xx:xx:xxx]: Component: comp1; Installed: Local; Request: Absent; Action: Absent All Components are Unregistered properly and all the correspondig registry keys are removed from ...\Installer\UserData and HKCR\Installer : MSI (s) (xx:xx) [xx:xx:xx:xxx]: Executing op: ActionStart(Name=ProcessComponents,Description=Updating component registration,) MSI (s) (xx:xx) [xx:xx:xx:xxx]: Executing op: ProgressTotal(Total=x,Type=1,ByteEquivalent=24000) MSI (s) (xx:xx) [xx:xx:xx:xxx]: Executing op: UnregisterSharedComponentProvider(Component={GUID},ProductCode={GUID}) MSI (s) (xx:xx) [xx:xx:xx:xxx]: Executing op: ComponentUnregister(ComponentId={GUID},,BinaryType=0,) All Components are Unregistered properly and all the correspondig registry keys are removed from ...\Installer\UserData and HKCR\Installer  MSI (s) (xx:xx) [xx:xx:xx:xxx]: Executing op: ActionStart(Name=UnpublishFeatures,Description=Unpublishing product features,Template=Feature: [1]) MSI (s) (xx:xx) [xx:xx:xx:xxx]: Executing op: FeatureUnpublish(Feature=feature1,,Absent=2,) MSI (s) (xx:xx) [xx:xx:xx:xxx]: Note: 1: 1402 2: UNKNOWN\Installer\Features\GUID 3: 2 All Files and folders are "removed" from the system (more on error 2318 later) MSI (s) (xx:xx) [xx:xx:xx:xxx]: Executing op: SetTargetFolder(Folder=C:\xx\xx)  MSI (s) (xx:xx) [xx:xx:xx:xxx]: Executing op: FileRemove(,FileName=file1.dll,,ComponentId={GUID}) MSI (s) (xx:xx) [xx:xx:xx:xxx]: Verifying accessibility of file: file1.dll MSI (s) (xx:xx) [xx:xx:xx:xxx]: Note: 1: 2318 2: MSI (s) (xx:xx) [xx:xx:xx:xxx]: Note: 1: 2318 2: I'm testing those Installations in a virtual machine with full admin privilege and revert to a snapshot when I encounter that error, so this isn't caused by older installation. All my CustomActions have "NOT UPGRADINGPRODUCTCODE" in their condition and none of them is getting executed   When I create a new test project I don't have this problem. The only difference in the Log file are the two "Note: 1: 2318 2:" messages behind the file removal are missing. This tells me that, even when MSI is able to remove all of the files, it "thinks" it doesn't have the rights to open them. Can anyone confirm my suspicions, has a solution or a better explanation for this behaviour? Thanks in advance!   (I removed some of the data that mightbe considered sensitive.) ... View more