My advice is never to use any torrent sites! They are unsafe, illegal and contain many viruses. If you want to play these cool games then I suggest you pay for them on legitimate sites like this.

I have Vista Basic and I had real problems with it until I turned off the User Account Control (UAC). It's what brings up all those dialogue boxes all the time  that ask if you are sure you want to run or change something.
To turn it off log to an account that is the administrator account and go to the Control Panel in the Start Menu. Next Click on 'User Accounts and Family Safety', then click on 'User Accounts'. Now it will give the details of your account and at the bottom it will say 'Turn User Account Control on or off' click on it and turn it off! This solved all my Vista problems.

Good luck!