I've mu install.xml file with:

    <media destination="com_mycomp/images" folder="media">
        <filename>images/file1.png</filename>
        <filename>images/file2.gif</filename>
    </media>

and throughout cellular phone folders are produced but don't copy the files? Why?

My component folder structure:

com_mycomp
|
install.xml
|
+--- site
|    |
|    + (...)
|
+--- admin
|    |
|    + (...)
|
+--- media
     |
     + images
       |
       + file1.png
       |
       + file2.gif

How you can put files to media folder on installation?

<media destination="com_mycomp" folder="media"> 
     <folder>images</folder>
</media>

make use of this sample code and it'll upload all file in images folder