I'm running DM 4.7 on vista without a problem. I suggest installing DM 4.6 instead of DM 4.7 and see if it will install to your system. You might have a firewall installed that is disallowing the installation of the DM software. I know with my firewall, I had to give it permission to install and run the files before it would fully install.
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i think that means you have downloaded it already, and now you just need to run it to install it. follow this and see if its there computer>c: drive>program files>research in motion>blackberry and see if there is a desktop manager there. if there is click on the exe file, or the desktop manger file if there is no exe
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