Q: I just switched from Norton to Kaspersky and a full scan would take norton half an hour would take more then 12 hours. Btw its vista.
A: You have a lot of junk on your computer. Old files, fragmented files. When was the last time you ran a clean-up? Download VoptXP is a free clean-up. Also, have you gone into your computer & ran the compact program under "Systems Tools"? And then "Defragment" program? I've had Kaspersky for five years, I run it weekly or when I suspect I caught something, takes about ten minutes.