Did you make sure to do the usual, like install SP1 and subsequent updates, make sure you had AV software installed before connecting to the Internet, and avoid using Internet Explorer at least until all security updates had been applied?
Why is Windows 7 Ultimate very slow? I've done a complete reinstallation of windows 7 ultimate wiped out the entire disk, after installing a few programs it starts to become slow, (Its like watching paint dry) Here I will list the system's
CPU: Intel Core i7 740QM, 1,73GHZ
VGA: Nvidia Geforce 460M: VRAM 1.50GB
OS: Windows 7 Ultimate