Are you familiar with services?
If you do not use Security Center, you might consider removing its service. Its simply titled "security center" . You can press the WindowsKey+R and then type:
MSCONFIG
and go to the Services tag, and uncheck"Security Center". If you are not familiar with the computer, write these down in case something goes absolutely terribly wrong and you have to get it back using Safe Mode. It is the exact reverse, you just click the checkbox again.
Now, much as I may dislike pirating, if you did anything to modify the Windows Logon file or disable WGA, whether with good legal reasoning or not, I dont recommend you do this. (Not saying you did, but a lot of people who have had problems "activating" Windows either because they installed it on their new computer, or whatever, have gone the route of bypassing it..)
Note:
Security center happens to be an extremely good program when you need to be yelled at since you are browsing the net without antivirus, or firewall. The only excuse to not have firewall is if your insane. Windows Firewall works great, no matter what many others say. Its built in, for one, meaning directly intergraded, and its frequently updated, unlike Sygate and other older but nice firewalls. Even over dialup, basic firewall should be used. As for Antivirus, viruses come in small packages, and get on by only visiting a website now-a-days.
As for Windows Updates:
Though they may seem evil, they are important. They fix many bugs and random issues that will/can occur with your system. If you want to keep things running at their best, be sure to install your updates.
Security center is not memory intensive. Its not going to free many resources by doing something as you are attempting.
Wow! I could write that into an Frequently Asked Question article.