Thanks that's great info, I never knew it was a fault in Spybot. Any info on whether the extremely slow starting up of my pc when I turn it on is due to having installed Norton Anti-virus? The problem started around the same time.
It is possible that NAV and McAfee security suites are to blame for a slow starting PC, but it is usually due to multiple problems beside one program.
Use Spybot, Advanced Mode, Tools, System Startup and see what is being fired off when your system starts. You haven't lived until MS starts downloading updates, your antivirus has a major update, Adobe tries to auto-download and another half dozen programs try immediate checks for updates, while your virus/spyware scanner checks everything for validity. I turn off auto-updates on all of my systems, but I will occasionally keep the Windows updates on for a difficult client.
When I was a certified "Internet security specialist" we felt that Sophos AV was the best AV for corporations. Now I use mostly AVG Free, since it's memory footprint and network usage is small. Being free, I can give it to all of my home customers without violating license agreements.