I always do a clean install
That's why I can say for sure that portable copies of the following software does NOT work with Windows 8
Adobe Illustrator CS3
Adobe Photoshop CS5
Adobe Audition CS3
Handbrake Portable
Quicktime Portable
Massive Portable
Soundforge Portable
and many NON-Portable apps as well including some games I like that work fine in XP
SOME portable apps made with thinstall "DO" work with Windows 8 such as older versions of adobe products that I would never use if I had a choice
30-day trials were used for these tests and thinstall has been sold to VMWare recently
Other tests may resume with a 30-day trial of VMWare's version of thinstall (I think its thinApp if I recall) but unless you do the research, you cannot simply say these app's will suddenly magically work with Windows 8 using a clean install
Why portable app's?
Because they eliminate registry conflicts and .DLL errors that are created using full installs of certain products
I have not had a single Blue Screen of death on my XP computer for over 5 years by using only portable applications and install only those applications that cannot be made portable but which I absolutely need with my computer
Now go do some research before you start making such remarks
Windows 8 also doesn't work with certain installed copies of daemon-CD, Nero Burning Rom, Ramdisk, DriveCrrpt and games that work fine in XP such as Jetfighter 4
I will not be spending several thousand dollars to update all my software just to use it on a Government Sponsored Spyware Platform if it already works fine on an XP machine
I do not PAY to downgrade my computing experience such as losing the ability to record "What you hear" and then adding a ton of DRM crap and spyware on top of it
This area is for listing what Window 8 DOES NOT DO, and to do so, research is required !
Now go do some research