Question for all computer Programmers....

I was given a small job and i am not sure if i can do it so i wanted to ask your opinion. There are tons of text files, the sample i have to work with is in notepad format. The thing is like an inventory with security features in it. It has junk mixed with real inventory. I need to write a program so that when i enter this text file , the output is a text file with the junk omitted. I have general ideas of how to do this. My question is, what programming language would be best suited to do this. C++? or possibly even Visual Baisc maybe?
IF you notice, the junk is basicallly non-conventional characters, so this should not be too hard. I can program this in C to do it easily but I dont know how to create the user interface portion of the program in C to make it very user friendly.

All programmming languages should have File I/O features. Just use one in which you are comfortable with. As for a GUI, is there really a need to have one? A command-line app since fine here.

Visual basic makes it really easy to do UIs. I'm not a big fan of the language itself though. Supposedly C# has the same UI tools but with a C++ syntax - Microsoft Visual Studio.Net has the C# tools.

Have you considered perl? It was invented to handle I believe, to manage large log files on remote servers. No cost ... standard on linux boxes (check activestate perl for a windows port). Lots of examples around.

A 'C' program that only copies the readable ascii should take few minutes to write ...