Microsoft Windows Live unified installer has been released that will update your Windows Live Writer 2008 to a non-beta version.
The download link for new Windows Live Installer is available here. [exe 2.4 MB]
This should also fix the installation issues related to the previous WLInstaller.exe program.
The final version of Windows Live Writer 2008 supports 64bit Vista. And the whitespaces will no longer be substituted with
1. Blogger image uploading fixed for externally hosted blogs.
2. <pre> handling in XHTML mode is fixed. Beta 3 would collapse whitespace in all tags, including <pre>, in XHTML mode.
If you have trouble installing the new Windows Live programs, Microsoft recommends deleting old Windows Live installations using the uninstaller available here.