First disable your antivirus or internet security temporarily...go to device manager....uninstall USB drivers...get your sp3 pack ready...when you boot up...install sp3 over it...make sure antivirus remains disabled until you complete the installation...Reboot and the error should stop..if it...
SuperAntispyware is really good
I use super antispyware all the time and it has never disappointed me. It has very good detection rate that surpasses many of the current antispyware programs. Updates is the one point it needs some improvement in.