ok, i've recently re-install my windows 7. and now i just want to keep my win 7 not mess up and have more space. my question is, is there any other new file in C:\windows or system32 come up after I install a new software? except the c:\program file. or any other remaining data or registry saved even after i uninstall the program from control panel? sorry for my english.
If you want a perfected image of everything exactly the way it is now, you can create a system image which is essentially a picture of your drive with everything the way it is now.
So if you were to restore this system image, it would return everything to the way it is at this moment it was taken.
See here:
Backup Complete Computer - Create an Image Backup
If your asking where the locations as to where most programs install themselves, to check for complete removal the following folders/areas are common:
-Program files
-The users appdata folder
-Startup entries
-Services
-In the registry under Hkey/current users/software
If you install programs, you also get .dlls (like subroutines) that end up in the system32 folder. If you uninstall those programs, the .dlls remain in your system. That's why the winsxs folder grows over time. The winsxs folder is not a real folder but a kind of directory of most system files/folders.
I think you did not understand the concept. .dlls are subroutines that belong to one or several programs and are stored in the system32 folder. If you delete them, one or several programs (or the whole system) will malfunction.so, the software name, the extensions is .dlls? can we just delete it? is it under any folder in system32
Data is one matter - .dlls are another. The reason why .dlls cannot be deleted is their concept. They are subroutines which can be used by any program - regardless which program originally installed them.
Example: Program A installs .dlls a1, a2 and a3. Next day you install program B which brings .dlls b1 and a2. Since a2 is already installed, program B will use that.
If you now uninstall program A, the uninstaller cannot uninstall .dlls a1, a2 and a3 because it does not know which other programs might be using those .dlls (in our case program B using .dll a2). So to be on the safe side, all .dlls that are in the system remain in the system - regardless whether the original source programs are still present or not.
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