[Scenario]

This error is still occurring. I've completely removed .net Framework 1.1 and tried installing .net Framework 3.5, yet the installation file wouldn't run. I just completed the installation of .net Framework 4.0, restarted but to no avail! What could be the issue

EDIT: I un-installed all .net Framework versions from my computer. I left NO trace. This morning I installed .net Framework 1.1, restarted and attempted to install .net Framework 3.5. The installation file still wouldn't run! I don't understand why every other version, besides 3.5, will install correctly!