Security tool virus

Hi
I am new to GeekPolice.
I have a windows XP computer which I believe is infected with Security tool virus.

It will not boot now - and I can not start in safe mode either - the screen just goes blank, when I try.

Is there any way to recover this?
I am grateful for any help

Avira AntiVir Rescue System is a Linux-based application that allows accessing computers that cannot be booted anymore.

• Download The Avira AntiVir Rescue System from Antivir.de.
  
• Just double-click on the rescue system package to burn it to a CD/DVD.
  
• Then please use that CD/DVD with Avira Rescue System to boot your computer.
  

You'll get a boot option to either boot from hard drive or AntiVir Rescue System.


Press the number 2 on your keyboard to boot into AntiVir Rescue System.

Please wait until drivers are loaded and Main menu shows. Then please select the second option “Scan your system with AntiVir” and hit Enter.


Under Configuration, please select Scan all files, Try to repair infected files and Rename files if they cannot be removed?.


Then please start the scan.

The Avira AntiVir Rescue System wil now

• repair a damaged system,
  
• rescue data,
  
• scan the system for virus infections.
  

Hi
Many thanks for your reply

I have downloaded and tried to access the Boot Options - but I can not get the computer to start.

I have tried to start in safe mode but it will not.
I have also tried pressing del on startup and changing the bios to enable boot up floppy seek - but no different

the screen goes blank when it starts to boot

Thanks again - any help appreciated