The solution to the "serious failure" of NET4.0 prompt in xp system installation

I don't remember the specific error code, and there seems to be no hint to check the error log! Baidu found a big circle and didn't solve it! Today, I inadvertently checked the security settings of the disk, and found that there was a lack of permissions for system and administers groups (previously, in order to restrict user access, the disk was given a minimum authorization). After joining the permissions of these two roles today, net4.0 was successfully installed! Ha ha! This problem has been entangled for a long time. Today, I wanted to install a software, which prompted me to install net4.0 first or could not install it. I planned to reinstall the system, but I could not access the e disk through the CD-ROM dos. I remembered the permission settings I had done before, so I changed the permission settings and tried to install them. (although I have a lot of luck in my heart), it seems that some minor problems do not have to be too entangled. It will come naturally after a period of time! The disaster caused by perfectionism, mm-hmm.