A boot scan scans before windows is loaded, and usually will pick up infecte files as they are being loaded.
Looking at the picture you posted, 1 file is in the system restore. That is the first file listed. To remove it, turn system restore off, schedule a boot time scan. Note you will lose all restore points.
The other two are probably the ones that are redirecting your browser and preventing you from changing your home page. Locate the files, scan them and if they are infected ,MOVE them to the chest and see if your problem goes away. Make sure that you do the disable system restore first or that file will be resotred to your computor.
