Unable to add apps to Launchpad

Hi guys, I am on os x 10.8.2.
I decided to remove parallel 8 and windows 7 from my mba. After removing everything, there is still a windows 7 application folder so I used the command I found online
rm ~/Library/Application\ Support/Dock/*.db ; killall dock
So my problem now is it removes all my apps from launchpad and I can't even add them back by dragging to launchpad dock icon.

Please help.