Error 1402 Installing BB Desktop Software on Windows 7

Hello,
I have a question that may seem trivial to you but it is serrious for me.
I tried to install Blackberry Desktop Software 5 on my Windows 7 OS computer and got the following error:
Error 1402. Could not open key:
BlackBerry Desktop Software 5.0 Installer Information
UNKNOWNComponentsDA42BC89BF25F5BD0AF18C3B9B1A1EE8 0002119F20000000000000000F01FEC. Verify that you have sufficient access to that key, or contact your support personnel.

I tried to change the permissions but failed again. Do I need to reset the permissions and if so, how do I do that?
Thanks!
Lilian
