Instructions:
First attempt to uninstall via Control Panel / Add or Remove Programs. If the STEP 7-Micro/WIN V4 software is still entered there and it is not possible to uninstall it, then please proceed as follows.

Important:
Make a backup of your existing STEP 7-Micro/WIN projects.

Delete program files

• Navigate to your STEP 7-Micro/WIN directory in the Windows Explorer and delete it (default directory: C:\Program Files\Siemens\STEP 7-MicroWIN V4.0)

Delete Registry entries

• Click on Start > Run....
• Enter "regedit" in the command line and acknowledge with "OK".

Fig. 01: Opening the Registry editor

• Save your current Registry by marking "My Computer" and via File > Export... making a backup of your Registry data.
• Open the directory HKEY_LOCAL_MACHINE\ Software\ Microsoft\ Windows\ CurrentVersion\ Uninstall.
• Mark the Uninstall folder and open the Find dialog via Edit > Find....
• Enter STEP 7-Micro/WIN for "Find what:" and select all the "Look at" options in the Find mask.
• Start the search with Find Next.

Fig. 02: Finding the Registry entry

• The Registry entry to be found depends on the version of STEP 7 Micro/WIN installed. To make sure that you find the right Registry entry please check whether the "DisplayName" code matches one of the "MicroWin Release" column entries in Table 01 (example: theDisplayName code of STEP 7-Micro/WIN V4.0 is SIMATIC STEP 7-Micro/WIN V4.0.7.10).
• Mark the folder in which you have found the DisplayName code with the correct value anddelete it from the directory HKEY_LOCAL_MACHINE\ Software\ Microsoft\ Windows\ CurrentVersion\ Uninstall in the Registry.

Fig. 03: Deleting the Registry entry
 

MicroWin Release	Uninstall GUID
V4.0.0.81	{49844738-872E-4348-88DD-63B3C39548C2}
V4.0.1.10	{91F7EA3B-BB8A-4FA2-B37B-3D076D54C5EE}
V4.0.2.29	{FDB8663D-AC1C-4390-ADEB-806922AF22F4}
V4.0.3.04	{65088BA8-DD5C-4EA0-8CDF-C2D2577978AF}
V4.0.4.16	{D668B8E1-B877-4BDC-B7F6-8C7568297884}
V4.0.5.08	{B57D2D30-6E6A-11DB-9FE1-0800200C9A66}
V4.0.6.35	{6E864646-5186-11DC-8314-0800200C9A66}
V4.0.7.10	{BCC878B0-0EC2-4AE5-875C-C2D5434A8882}

Table 01

Important:
In general, no warranty can be given for direct changes in the Registry because this is entirely the responsibility of the user. In any event, you are advised to make a backup of the registry before undertaking the actions described here.

Keywords:
MicroWin, Uninstallation, Aborted