Post your mounting commands here.

The mounting commands are:

1mount x d:\
2x:
3cd x:\vvv program folder\
4vvv

A question. My program is not on dosbox folder. It must be there?

What drive is x? is it a physical drive? hard disk or cdrom?

I think you should have at look at the forum Guides Section.

Some examples.

Let's assume you have all your dos programs in a folder called dosp (using shortnames for DOSBox related stuff is advisable). And also, you need to install a program (invoked with install.exe from your cd-rom drive {which has physical letter h}. So, you will need to mount both the hard disk (destination) and the cdrom (source). You will issue the following commands:

Z:\>mount c c:\dosp
Z:\>mount d h:\ -t cdrom
Z:\>d:
D:\>install.exe
{we are installing to c:\myprog folder. Wait for install to finish}
D:\>c:
C:\>cd myprog
C:\MYPROG\>run.exe

And so on.

x is my virtual partition of dosbox, and is on my hard disk. My program vvv is on partition D:\ of my hard disk, in folder "My program".

you haven't mounted a c drive nor a d drive. Mounting an x drive will only screw everything up. Games, programs expect a c drive and games with cd-roms expect mostly a d drive.
Also long path names are not supported, shorten the program folder to 8 characters.