I installed Spybot S&D 2 and like others found the live protection 'irritating' My system took 7 or 8 minutes to boot up and the pop up window made doing something useful while a program was being scanned difficult.

So I followed the instructions and disabled the live protection service - and things got immediately worse!!!

Every process (e.g. start up IE) now takes around 30 seconds to start. It is as if the part of S&D that kicked off the live protection scan is waiting for the scan to report completion and eventually times out after 30 seconds.

Uninstall S&D fixed the problem immediately.

Shame

HTH
2GB RAM; 150GB HDD
twin 2.4GHz processors
Tecra M5 running XP SP3