Enable Third Party Themes in Windows Vista SP1
If you want to use third party themes in Windows Vista, you have to modify some system files before you can use those themes. That is because Vista, as well as XP, accepts only themes that are digitally signed.
For unsigned themes, you have to modify three files in system32 folder. Here’s a link to those already modified files. You just need to take ownership of those files before you can replace them.
For an easy to way to take ownership of file, you can use VistaTweaker and check the option that puts a Take Owneship entry in the righ-click context menu. You can search the internet for instructions on how to do that manually.
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