How it is difficult to reinstall vs2005 after vs2008 is uninstalled

How it is difficult to reinstall vs2005 after vs2008 is uninstalled

it took a day to download and install vs2008. In addition to some new features, it was found that there were no other attractive points. I just didn't use it. I used space again. Forget it. unload it.
when installing vs2008, you will be prompted that vs2005 may need to be reinstalled, and you did not care about it at the beginning.
(in fact, vs2005 is also usable when vs2008 is uninstalled, but it is not reassuring .)
to make things easier and prevent accidents, uninstall and reinstall vs2005. The tragedy began.
I originally wanted to use the normal channel-add and delete a program, uninstall vs2005, and find that the uninstallation will fail. It is strange to say that the uninstallation file is damaged.
forget it. Cut it down first. Delete the vs2005 directory. It doesn't matter if you delete it. It destroys everything.
if you want to use the autorun installer for installation, you will be prompted to change or remove vs2005. Click to enter. When the installer detects half of it, the system will prompt that vs_setup.msi cannot be enabled, ask if it is a legal MSI package.
I checked the MSI version and found it was the latest version 3.1. Is the version incompatible? Unlikely. Forget it. You can download a version 3.0. When installing the version, the system prompts that the version is updated and cannot be installed. It seems that 3.1 is not needed.
later I found out why there is change or remove vs2005 in autorun, rather than install vs2005? The Registry is not cleared. It must be. After checking the Visual Studio environment in the Registry, the system prompts "change or remove vs2005. This is crazy.
take a break and finish the operation at night.
I searched a lot of information online and found that there was no value. It is useless to download a dedicated uninstall tool for vs2005.
continue searching ......
Windows Installer clean up Uninstall. Is it fun? No matter what it is, use it first. When running, you can find the installation item of vs2005 and uninstall it.
at this time, the program is run again with Autorun. It has changed to the "dream" Install vs2005.
sigh: some things are not casual, so be careful.

uninstall vs2008 and reinstall vs2005