Here it is..
I tried to convert .mkv file into .avi and then .mp4 none of it worked. Screenshots are attached..
but when I tried converting from .avi to .mkv it worked (which I don't need actually)

Solutions applied:
Uninstalled the way it is one AVS's website from registry, program files etc. deleted everything and re-installed (nothing happened)
then used that repair thing it didn't worked (100% successful) yet I receive error(s).

Check the screenshots and reply back.

P.s. it is version 8.0.1.492 (the latest one I believe)
So please help...

To: uq91

Hello,

First of all please make sure that your mkv are not broken and play without defects in video player software.

If it is not the case, we need your files to solve the problem.

Please upload them to our ftp-server, the instructions will be given to your in our support system. The password to log into it will be sent to your e-mail address.

Also, please specify your PC configuration (Operating system, CPU, Ram).

Best regards.

To: Vlad

Yes I got all the instructions its just that those .mkv files are 4-500mbs etc. I am searching for some 5-6mb sample files as soon as I get it I will upload them.
PC Config:
2.00 ghz dual core
2 gb ram
Windows 7 - 32 bit

To: Vlad

Hello Vlad,
Ohk.. the sample of 5mb it did like a charm other than that.. any .mkv file like usually movies I have of 4-700mb almost
It doesn't, it just gets stuck and again those different errors I told you before..
Why is it that it can convert 5mb same format without any problems but with larger files it starts giving errors?
and how should I upload that 550mb file? o_O

Btw thanks for your support and help!

To: uq91

That may be a problem with large files, so we need them to fix it. Please upload it to our ftp-server or to any fileshare source, for example www.filefactory.com

To: Vlad

I can provide you link of any torrent (movie) in mkv format you can check that?
If yes here is one:
http://btjunkie.org/torrent/The-Sunset-Limited-2011-HBO-720p-HDTV-x264-550mb-YIFY/435849e41ac2e492d6e7a604892973e7a26c5dbe757a

To: uq91

Hello,

Sorry for the delay and thank you for the link to file.

Possible solution has been sent to you in our support system.

Best regards.