How to protect our company with anti-virus protection for Asian viruses?

Our company recently had someone from overseas China connect their laptop to our network system. Ever since then, our internet has been running really slow, one of our database servers completely crashed, and a lot of other misc. computer problems. We have deduced that the China laptop may have infected our network system with some kind of chinese virus which cannot be scanned or fixed by the american anti-virus protection we currently run.

Is there some kind of chinese antivirus protection software that I can obtain to run on our network system to try and scan for the infection?

Or does anyone have any ideas on how to rectify the situation....other than reformatting all our computers in our company%26gt;

Thanks!

How to protect our company with anti-virus protection for Asian viruses?mcaffee

Use Linux as OS in your servers.

Try a online antivirus scanner and a online anti-adware/malware/spyware scanner in safe mode with network to clean up your computer BEFORE you download anything.

Turn off system restore before you boot up in safe mode with network to clear your system restore points for viruses, spyware, adware etc.

To get in safe mode tap F8 when booting you computer.

Choose "Safe mode with network".

Go to Start 鈥?Run - type iexplore http://www.bitdefender.com/scan8/ie.html Enter(ok).

Do a full system scan. If something is found, delete it, reboot and do the same again in safe mode with network.