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Windows 7: Can't change setting System Properties > network ID setting
I am trying to add a refurbished HP system to my menagerie. It had Windows 7 Pro (64bit) installed when I got it. I went through the setup without any problems, created a user account for myself (Lewis), set the system name to TestPC and started installing and testing some software. Simple internet access (web page browsing) is working fine.
Today, I connected and external disk drive (from a Windows XP system) and I was able to successfully read anything on it. But when I attempted to delete a file, I was told I needed permission even though I am the administrator. I found some instructions at Microsoft for changing ownership of the files on the external drive, so I did that. It was then that I noticed the user name shown was Lewis(TestPC\Lewis) and I was still not able to delete files on the external drive.
Being primarily a Unix person, I have been fumbling around looking for something that would indicate why Windows felt the need to attach the system name to user names. In Computer>Properties>Computer name, domain and workgroup settings>System Properties>Computer Name>Network ID, I found a selection with the following description: "This computer is part of aa business network; I use it to connect to other computers at work". Since this is not true, I selected the other option and worked my way back out to restart the computer.
After the restart, that erroneous setting was still there. I have tried several more times to change it but they have all failed.
Any suggestions would be appreciated.
Thanks,
Lewis