Unable to get rid of over 100 virus' and...

You will most likely need to use some software to assist in removing all the problem files. You can try booting into safe mode and manually deleting the offending files if you know where they are located. This anti-malware program is free: http://www.malwarebytes.org/ This is another free tool to clean up your system: http://www.ccleaner.com/. There are free anti-virus programs available such as http://free.avg.com/. I'd recommend installing something for protection in the future.

Good luck!

I would also download the anti rootkit from AVG ...as it sounds like the virustrigger you mentioned is starting up when you boot the PC
all AVG products are available at
www.grisoft,com

choose the free version to sort out the problems and upgrade later if you want to

What are you using to scan? There is quite a bit of malicious software that poses as legit software.

I suggest downloading MalwareBytes onto a USB stick. Install this onto your infected system using the key. If you have a problem installing, try to open Task Manager and kill all suspicious processes -- then try to install. Let me know if you need more details on this.