windows vista custom theme help

some one please help i wanna havve custom themes on vista i add the patched .dll’s and i got owner ship to the files and tht but i get this messge

its not opend by another program
Answer #1
Virus maybe?!
Answer #2
download ‘unlocker’ (google), right click on the file that you are trying to overwrite, and select ‘unlock’. then overwrite the file
Answer #3
try selecting a “standard” theme, no skin, just the gray color
and see if you can work with it after that
these are the steps that worked for me
How To Install
1. Login as a user with Administrative privileges -or- have Administrative credentials ready (check under the keyboard for a slip of paper).
2. Navigate to %systemroot%\System32
3. Right-click uxtheme.dll and click properties.
4. Take ownership of the file and close dialogs.
5. Repeat steps 3 and 4 for themeui.dll and shsvcs.dll
6. Right-click uxtheme.dll and click properties.
7. Give yourself (or group) Full Control permissions and close dialogs.
8. Repeat steps 6 and 7 for themeui.dll and shsvcs.dll.
9. Rename uxtheme.dll to uxtheme.old.
10. Rename themeui.dll to themeui.old.
11. Rename shsvcs.dll to shsvcs.old.
12. Copy patched files into %systemroot%\System32
13. Reboot (yes, this is really required)
14. Enjoy!