I have been using a custom made desktop which is installed with windows 7. for some time now, I can not install certain programs, such steam, the update opera, etc. Each time, when the installation starts, I'm entitled to "Error 1500 No source". Another installation is in progress. Finish then before installing again. Now I'm rebooting (and search the web solution), it does not work. Anybody have an idea. Thank you
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