我应该在C：\ Program Files或C：\ Program Files（x86）下安装Visual Studio吗？

The development environmeng is x86, and the target is to compile .EXE that for both 32-bit or 64-bit Windows systems. Which folder shall I install? Seems the default installation folder is C:\programs files (x86), though I'm on a 64-bits Windows 7 OS. what's the difference on either one to install? The development environmeng is x86, and the tar