Of course, I opened it immediately. If you were using Microsoft Outlook, that click was a mistake. It helped propel the virus into more computers by replicating itself and mailing itself to every email address in your Outlook address book. The virus infected local and remote drives including files with the extensions vbs, vbe, js, jse, css, wsh, sct, hta, jpg, jpeg, mp3 and mp2. Visual Basic is a programming language, and VB script is a little program.
Little programs are what viruses are all about.
You do not want to run little unknown programs that arrive attached to emails. Ditto for Excel spreadsheets. If you don't have anti-virus software, get it. Then you must update it via the Web every 30-90 days. Also, remember to use it to scan your computer from time to time, as well as any questionable email attachments.