Windows 7: .exe files automatically disappeared??

Hi
currently I experiencing a problem .. that's my .exe files auto disappeared from my computer ..
I don't know why .. I tried to download it again , but with 0 bytes .. When I click on the files it just pop out this msg '' is not valid win32 application .
So Im using my father lap top to download the files and copy to my USB pend to transfer the file , but once I open my USB folder my .exe files automatically disappeared ..
I wondering what happened ..

Sounds like a virus....run Malwarebytes Anti-Malware if possible. If all your .exe files were gone, you wouldn't be able to run Windows at all.

Malwarebytes
Hitman Pro

You should scan your entire computer .

There is another possibility.
Possibly something mischevious has changed the settings on your computer.
Are you sure the programs are gone, or just hidden?
If the latter, have a look here.

First. Open , in windows explorer, Tools - Folder Options - View. Make sure you have the option "Show hidden files..etc, ticked. -- Apply.
After this, if you can now see the missing files, right click a couple and check properties, untick the option "Hidden".

You may need a reboot after the first step.

All failing, start a new account using the Global adminstartor. If you are not familiar with that, there is a tutorial on this site. Try the above again.