[RESOLVED] Advice on Spybot S&D findings, please?

When I ran Spybot S&D this afternoon one of the "problem" findings was this:

Windows Security Centre. Antivirus Override



Can anyone please explain what this means? (Is Windows overriding Spybot & why?)

Should I delete it or leave it?

And could this have had any impact on why internet access on my computer has been so sluggish recently?

Thanks in advance,
Olga