I just downloaded MiKTeX and TeXstudio from CTAN as a zip file ProTeXt-3.1.4-020114.exe
I then installed MiKTeX and TeXstudio.
But the TeXstudio can not compile/build/view after I created/save a file.
It seems to me that the configuration has not been set up properly.
What is the standard pdfLatex that I should use in MiKTeX/bin for compile and build in TeXstudio?
What is the (MiKTeX?) internal viewer that I should use for "view" in TeXstudio?
EDIT: I happened to have installed TeXstudio first. Then I installed MiKTeX. After I found out that TeXstudio compile/buid/view do not work, I uninstalled TeXstudio and reinstalled TeXstudio. But it still does work.
EDIT: It turned out that the problem is MiKTeX 2.9 installation. The log file said that "regsvr32 MiKTeX209-core.dll" failed when launched from mpm.exe. I did it manually and TeXstudio worked fine now.