I don't know what's your Problem. I have installed Fujitsu Compiler Version V30L10 on Windows 95 and NT without problems. What system you use? Fujitsu Compiler V30L10 should be incompatible with Win2000/XP.
But Warning: The free Fujitsu Compiler V30L10 has a nasty bug. I have described it in the thread "Signed numbers in Fujitsu Compiler Version V30L10 ?", see
I started to study COBOL about a half year ago and I had a big problem (like you now) to find a free and reliable compiler for learning.
Forget better the free Fujitsu V3L10 compiler. It seems to be good at the first sight, but it's not reliable and therefore not good for learning. Many people have reported several problems with it. Probably therefore it's free.
As well you have successfully installed it, and you try to compile the delivered samples, the compiler fails because of the bug with signed numbers. Read the thread "Signed numbers in Fujitsu Compiler Version V30L10 ?"
There are other reliable compilers - probably not free, but available:
Try the Microsoft COBOL Ver. 5 compiler at
and the Micro Focus Personal COBOL Compiler at
Both compilers work good on Win9x/NT/XP.
The MS compiler has a DOS based IDE, but works fine.
The MF Personal COBOL is the 16-bit Compiler and requires some patches to run on NT and XP. You can find them at
The compiler has a Windows Animator IDE. It works good too. The manual for IDE ise available at
This may be all you need to start learning COBOL
I wish You happy COBOLing.