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Microsoft .NET Framework 3.5 does not install

I just recently ran into a problem after I re-installed Windows XP Media Center Edition 2005 a few days ago. I tried to update my .NET Framework to v.3.5 so I could run Visual Studio Express, and every time the installation failed while trying to install .NET Framework 3.5.
So, I tried to install 3.5 off of the installation packages off of Microsoft.com, but still, to no success, I kept getting errors while trying to install any 3.5 package. So after some research, I found a neat tool that removes all .NET framework instances on your computer, and then you can install 3.5. Strange why this tool works, but here’s how to do it:
Download
http://cid-27e6a35d1a492af7.skydrive.live.com/self.aspx/Blog_Tools/dotnetfx_cleanup_tool.zip
or
http://blogs.msdn.com/astebner/attachment/8904493.ashx
How to Start the Process
First, go to your Add/Remove Programs in Control Panel.
Next, uninstall every version of .NET Framework that is installed on your machine.
Next, save and run the tool that you have downloaded from the links above.
Restart your computer.
Now, you must install ALL versions of the .NET Framework from here
(1.0) http://www.microsoft.com/downloads/details.aspx?FamilyID=D7158DEE-A83F-4E21-B05A-009D06457787&displaylang=en
(1.1) http://www.microsoft.com/downloads/details.aspx?familyid=262D25E3-F589-4842-8157-034D1E7CF3A3&displaylang=en
(1.1 SP1) http://www.microsoft.com/downloads/details.aspx?familyid=A8F5654F-088E-40B2-BBDB-A83353618B38&displaylang=en
(2.0) http://www.microsoft.com/downloads/details.aspx?familyid=0856EACB-4362-4B0D-8EDD-AAB15C5E04F5&displaylang=en
(2.0 SP1) http://www.microsoft.com/downloads/details.aspx?familyid=79BC3B77-E02C-4AD3-AACF-A7633F706BA5&displaylang=en
(3.0) http://www.microsoft.com/downloads/details.aspx?FamilyID=10CC340B-F857-4A14-83F5-25634C3BF043&displaylang=en
(3.0 SP1) http://www.microsoft.com/downloads/details.aspx?familyid=EC2CA85D-B255-4425-9E65-1E88A0BDB72A&displaylang=en
There. Now install 3.5
http://www.microsoft.com/downloads/details.aspx?FamilyId=333325FD-AE52-4E35-B531-508D977D32A6&displaylang=en
And feel free to install SP1 of 3.5
http://www.microsoft.com/downloads/details.aspx?familyid=AB99342F-5D1A-413D-8319-81DA479AB0D7&displaylang=en

Cool huh? I spent a long time finding these answers with Google, so they obviously need to be spread!! (re-written by me)
Hope this helps others.