After installing Spybot and scanning and immunizing my PC it started crawling at a snails pace. On the Trend Micro site (solution id 1033903) it tells you to turn off immunization and then delete the 'usrwl.dat' file. I did this and the system is back to running normal. Does anyone know if there is a fix for this problem, as I would like to use the Spybot 'immunization' feature.