Springerrr:
While everyone is certainly welcome to contribute to any topic, to avoid confusion, please start a new thread when presenting a new problem. Adding new problems to a topic causes confusion for the original poster, for those trying to help and as well as for future readers trying to solve similar problems. Thanks for your cooperation.
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Which dlls have read-only attributes?
If you are using resident "SDHelper", the SDHelper.dll is used by both Windows Explorer (explorer.exe) and Windows Internet Explorer (iexplore.exe). If those programs are running you may not be able delete SDHelper.dll.