Do you have both 9 and 10 installed at the same time? If not, did you have them both installed at one time and unistalled one of them?
but nothing happens when i'm selecting reader.
I'm not sure exactly what you mean by this. What happens when you double click a PDF file?
week ago my windows crashed so i reinstalled it and install evry softare from beggining, and today i downloaded acrobat reader in version 10. i installed it and it should automatically set acrobat reader as default softare to open pdf files. but it doesnt happen. then i unistall version 10 and install 9 version but there is that same problem.
ok i'll try to say it in toher words
to set program as a default to oppening file a need to use option "open with" then i click choose program and i'm searching for exe file for reader when i find it a click it and click open and then acrobat reader should be listed. (but it's not listed, just nothing happens) and this is a problem.
it hard to explain this because my english is not so very good.
Can you open Reader if you use Start>All Programs>Adobe Reader or is it not listed there either?
If you CAN open it that way, can you open a PDF by using File>Open in Reader?
Please have a look at Ramesh Srinivasan's response on: http://answers.microsoft.com/en-us/windows/forum/windows_vista-windows_programs/problem-wi th-open-with-menu/76b17b64-2fe3-4c08-ac80-0ba80334dd8e
This should resolve the problem.