Hello,
Has any message shown while you are not able to remove vs6.0?
Any third party plugins, objects, controls, service-packs, or projects related to Visual Studio applications should be backed up or uninstalled before.
There have been some cases where multiple installation attempts were not successful while anti-virus products were installed. After a successful installation of Visual Studio components and re-install of the anti-virus application, the products co-existed without complications. You'll have to make that decision for your own machine, but definitely close all anti-virus related applications prior to proceeding.
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