just a thought could it be your anti virus program?
What Anti-virus program I don't have any, I'm administrator of the system and I tried running it as admin too.
I don't have anti virus at all, I seem to do fine without it and I used uTorrent to download the client.
Lol, you should probably get some... especially if you're using Torrents. Those things are packed full of viruses from my experience.