Goodbye F-Secure Internet Security

I've been using F-Secure Internet Security 2008 for a while now on our PCs at home. It got good reviews and worked well for some months. But a couple of laptops started hanging with increasing frequency during the boot process. I tried various things - removing apps that started automatically, cleaning up the Registry. No improvement until I removed F-Secure Internet Security. Both laptops now boot quicker and never hang. I'm now using one of the free anti-virus products while I select a new security suite. Norton Internet Security 2009 has had some good reviews- apparently this version is much faster and less 'bloated'  - so I may go for that one.