Your problem is running LW, their problem is running programs they've downlded. It's against forum rules to discuss how to deal with warez (illegally obtained) programs.

Not enough OSX people are aware that after installing new programs or system updates, you should do a SAFE Boot by restarting whilst holding down the SHIFT key until you see the message Safe Booting. Then after it's started up, go to Utilities folder, open Disk Utility & repair permissions. Then reboot normally.

If drag & drop abilities stop, then a more severe issue may be at hand. Running 3rd party utilities such as Norton, Tech Tool Pro, Disk Warrior, etc. are probably the way to go. Also rebooting with the OSX installer disk & doing repairs using Disk Utility.

However the person above's problem might be that the downlded warez aren't complete files or are corrupted.