As what others advised. it's better to reinstall your OS.
If you insist on cleaning it, try Kaspersky rescue disc.
Here’s the detailed step-by-step on how to use Kaspersky Rescue Disk.
1. Download latest Kaspersky Rescue Disk ISO. @ http://dnl-eu10.kaspersky-labs.com/devbuilds/RescueDisk/
2. Burn the ISO with your CD/DVD burning software.
3. After finished burning Kaspersky Rescue Disk to CD, insert the CD to your CD/DVD-ROM, and boot up your computer with it.