I'm sorry but I don't know what "MS Essentials Alert" is. A Google search suggests it could be a fake antivirus.
Where are you being asked to download .vbs?
It sounds like it's time to visit one of the free malware removal sites for assistance.
http://community.norton.com/t5/Tech-Outpost/Malware-Removal-Forum-Recommendations/m-p/1059145