Giro1221

Try allocating more Memory to MineCraft. The Launcher should have an option to do so under well, Options. If that doesn't work try reducing the Graphics options.

Are you perhaps looking for Tekkit? Technic is SSP only, not SMP.

Okay... Not too sure why you copied a line from the Problem Description into where your AV should be but that isn't the issue. The issue here is that a lot of mods take a lot more processing power, if you want a better framerate then either turn down your graphics for the modpacks or disable certain mods like Millinare which is known to be rather laggy at times.

Its a simple fix, go into AppData\Roaming\.techniclauncher\tekkit\config and go into either the IC2 or Ender Storage config and change the ID of one of the conflicting blocks. The problem should go away after that.

Ah, there you go. I was just trying to help out/

Did you Delete the .techniclauncher folder as well? The only other thing I can think of short of switching AVs is to completely disable AVG temporarily while you try to download Tekkit. The other thing would be are you on a Wired or Wireless connection?

Try deleting your .techniclauncher folder and redownloading the Launcher. Yes, its a bit of a crude fix-all, but it usually helps to start fresh. Where exactly does it fail in the Download?

Go into .Techniclauncher, then go to the Tekkit folder, then go into the Mods folder. You have two copies of the same mod in there, the simple fix is to delete the older mod. If their the same just delete one, and scour the rest of the folder for any more copied mods. If you leave doubles it will cause similar crashes.

What AV do you use? 9 times out of 10 here, its your AV making a fuss over the Launcher. Also a little hint, copy and paste error reports like that into a .txt file before you close the crashed Minecraft, so you can post them here. They really help in troubleshooting problems.

Posting your Launcher Log and an error report, if you get one when it crashes, will go a long way to helping you with your issue. As of now it could be anything. You really need to post more information.