One of secretaries in our company has accidentaly opened a *.zip with a *.exe inside. It was a worm. Unfortunately she deleted the mail completely because she thought it was a dud. Her anti virus tool was not able to stop the worm its seems. She is using Avast.
Now this worm is using her e-mail to send "Update-KB7359-x86.exe" to who ever is on her personal list. Her OS is Windows 2000.
How do I stop it and remove it... please help.