[Q] How to unistall Microsoft .Net Framework software

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Seniors!

Problems:
1- how to find out and uninstall (installed in ROM) .Net Framework?
2- or How to install 3.5 .Net Framework to override already installed later version?


Detail:
I flashed my Touch HD with energy ROM (july 2011 version) it has lower version Microsoft .Net Framework than 3.5 version and I want on my Mobile Shell software, ProPlus Freedom theme to work but It recommend 3.5 .Net. Problem is that when I play cab file to install 3.5 version it says you first unistall later version then install new one though in my installed program list I am not getting any option to uninstall the already installed version.........If I don't uninstall it then I wouldn't be able to install new 3.5 .Net and in return my ProPlus Freedom theme giving me errors....Please help me on the following