Services/Security Center

I am running Microsoft XP Pro SP2 with Norton AntiVirus and Spybot.

Whenever I shut down my computer for any reason, I find that my Security Center is disabled when I start up again. I believe I may have had a hacker, and possibly still do.

I run Spybot and I get a message regarding a registry change, which SpyBot deletes, but it always returns. The entry is as follows:

HKey_Local-Machine\System\Current Control Set\Services\wscsvc\Startl2w=2.

Can these two things be related and is there a way to keep my Security Center from being disabled.