Well, since i used mac on lab and MacBook Pro at home, so i need this helpful apps to use my irreplaceable windows apps. Hahahha.. So, download VMware Fusion .dmg from http://www.vmware.com/products/fusion/overview.html and get the fifth version for Mountain Lion. And install it as usual, now the fun part begin.
Add new Virtual OS, the one i used is Windows 7. Create it's image file (.iso) use Disk Utility.
So simple, yet sometimes(too many times (_ _")└(>o< )┘) just forget it and wonder how to do it. Well, now i use MacBook Pro for OS X and VMware Fusion for windows and the ethernet card for internet connection.
When i am on OS X mode, it easy to connect, just plug in the cable, set the proxy on Setting Preference --> Network --> Ethernet --> Advance