Windows Cannot find ...\WINWORD.exe in Win7 x64 ?

I just installed Microsoft Office 2010 x64
But when I want to open it this error appears :

Windows Cannot find 'C:\Program Files\Microsoft Office\Office14\WINWORD.exe'. Make sure you typed the name correctly, and try again.

I'm dead sure the file exist.
How can I fix it?

P.S:
-I recently edit the registry manually, before installing MS Office 2010
-I deleted some registry keys (20 to 25 reg keys).
-In addition, in opening some of other programs the same error has occurred.

Golden said:

Hi,

Click the Start Orb, and in the search box, type winword and hit enter. Does Word open? If not, it would seem the installation is corrupt (possibly the registry editing you did?) and you should uninstall and reinstall Word again.

Regards,
Golden

I've done it several times, but the same error has occurred.

Golden said:

Have you tried uninstalling, and reinstalling Word?

Just a quick check, can you check C:\Program Files (x86)\Microsoft Office\Office14

I've done it, nothing happened.