All mods gone after loading a custom pack

[BlueAmbulance1000]

Title: All mods gone after loading a custom pack

Version: 0.5.1

OS: Windows 7 Home Preuim

Java Version: Java 7.11 (Oracle corporation)

Description of Problem:

I loaded custom pack 3 with no mods, just checking it out so I can make a pack with the Ather mod. I download the Ather mod, but I gave up, leaving the custom pack untouched. I also loaded Hack/mine, Voltz, and Yogbox. I go back to playing Tekkit Lite, and then I load up my world. It shows a big list of missing mods. I click yes and everything from a mod was gone! I look in the mods folder and the whole thing is empty!

Error Messages:

Error Log:

[Maxis010]

You are still running the old launcher

Delete .techniclauncher and download the new launcher

[BlueAmbulance1000]

You are still running the old launcher

Delete .techniclauncher and download the new launcher

What is the old launcher? My Tekkit Lite version is actually 0.5.7.

I also have a question: When my mods are back, will my progress from my world be back or is it gone forever?

[Maxis010]

What is the old launcher?

It is the pre-platform launcher, download the new launcher from the website

Can't say for sure for your world but chances are minecraft deleted everything it didn't recognise

[BlueAmbulance1000]

It is the pre-platform launcher, download the new launcher from the website

Can't say for sure for your world but chances are minecraft deleted everything it didn't recognise

So 0.5.7 is the old launcher? Show me screenshots of wheat the old and new launcher would look like. I haven't changed my launcher since January of 2013.

[Maxis010]

I loaded custom pack 3 with no mods

The Custom pack 1, 2 and 3 stuff is part of the old launcher, the new launcher can support a lot more than 3 custom packs

This is an image of the new launcher

It was rolled out 14th Feb 2013

[BlueAmbulance1000]

The Custom pack 1, 2 and 3 stuff is part of the old launcher, the new launcher can support a lot more than 3 custom packs

This is an image of the new launcher

It was rolled out 14th Feb 2013

Can you give me the link to the page? What do I do with the old launcher?

[Maxis010]

http://www.technicpack.net/download

Delete the old one, the new launcher will install to .technic

[BlueAmbulance1000]

http://www.technicpack.net/download

Delete the old one, the new launcher will install to .technic

Do I also delete .techniclauncher?