AppCrash always when I work with my code

I write my application and two days a get different error messeage when I'm debuggin my code or close the project. Why?

The last code is:
Problem Event Name: APPCRASH
application Name: Basic4ppc Desktop.exe
application Version: 6.90.0.0
application TimeStamp: 4bca000a
Fault – modul name: ntdll.dll
Fault – modul version: 6.1.7601.17514
Fault – modul timestamp: 4ce7b96e
Exception code: c0000005
Exception – offset: 00052d94

And a next one:
Application Name: Basic4ppc Desktop.exe
Application Version: 6.90.0.0
Application Timestamp: 4bca000a
Fault Module Name: mscorwks.dll
Fault Module Version: 2.0.50727.5446
Fault Module Timestamp: 4d8cdc73
Exception Code: c0000005
Exception Offset: 00019fd3


What happened???

:sign0161:

I attached my app

Now I can't copy or paste or do anything in the b4p app. I get this error message:

Protected memory read or write was attempted. This often indicates that other areas of the memory is damaged.

I opened and ran your program. It works fine.

When do you get the error?

Usually when I select the first file very fast and click on cancel the two input box and the dir chooser. After this I run again and select the csv file again so fast, now my app crash at this time.

No crash here. You can try running the compiled application and see if it happens.

I downloaded it my home computer and it's works fine...

What heppened with my work computer???

Can do this development any other damage with my computer? Because the office coputer is not mine and store many important files...

I dont understand what happen in this code because I try it and first run it works fine and downloads the pictures, but when I run it again it stops on 17%...
After this I run again and now it works perfect again