If you download Abode Acrobat Reader 8 and try to install it on your Vista machine it could be that you'll encounter the following message:
If you do... following is the work around that i've found to the problem:
1. Start the installation as usual, do no dismiss the error message box.
2. Open erplorer and copy the "Adobe Reader 8" directory from the following path to your root dir
3. run the setup.exe from the "Adobe Reader 8" directory on your root dir.