I have tried labVIEW2013 and labVIEW2012, but still the problem exists. Don't know how to fix it.
and it just keep popping up for dozens of time until it finally comes to an incomplete and blank component:
Hi, thank you for your reply!
I have just fixed the problem! I have replaced all the content in "D:\Program Files\National Instruments\Shared\MKL" with another copy from my classmate who has successfully installed labVIEW2012. And it worked!
The problem was that when I tried to add an "simulation signal" component in the Block Diagram, an error message kept popping up indicating an error in loading "D:\Program Files\National Instruments\LabVIEW 2012\resource\lvanlys.dll" and DLL initialization examples failed. These messages kept popping up for dozens of times and finally a blank "simulation signal" component with no available attribute came up.
I guess the reason of this problem is that I have uninstalled labVIEW2013 on this computer before. When I searched the Internet I found that there is something wrong with the NI uninstallation and after you reinstall it there will be all kinds of problems.
Anyway it is so great that my labVIEW finally works, after I have spent this whole week trying all kinds of methods I can find on the Internet to fix it !
Sounds like a bad install. In the future if you see something like this it is best to perform a repair install, instead of copying files from other computers that you assume haven't been tampered with.