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Thank you all for your help. I have been trying all suggestions and surfing the net for the last 3 days and still have not found a solution. I am learning AB PLC online. The first I installed were RSLogix Micro and RSLinx Lite all version 3.8 and Emulate 500. The problem started when I advanced to Allen Bradley PACs and had to install Studio 5000 as well as all the supporting software. The RSLinx failed to work and then I decided to re-install, it would not. I downloaded version 3.9, the RSLinx worked but not the Studio 5000. I have now decided to RESET my computer and wipe off all installed program and start all over again. Now I would like to know from experienced experts whether I can install RXLogix Micro, RS Emulate 500, RSLinx Classic and Studio 5000 all on the same computer without conflicts and if possible how? Thank you all.

Thank you TWControls. I watched the video but did not find the file nor the folder. I deleted every folder or file related to Rockwell. Whenever I typed RSLinx classic into the search in Windows 10, the app shows but when I clicked on it, it does not work.

Hi Everyone. I need help bad. For some reason the RSLinx Classic on my computer was not working. I decided to re-install it but could not do that. Then I uninstalled it  but would not. I reinstalled all others but RSLinx would not. I cleaned the registry and again did not succeed either to install or uninstall. Does anybody have an idea what is going on? Please help. Thanks.