>I have just received the happy99.exe virus from someone via email. What action should I take (I haven't opened it).
>
>- Inform my ISP?
>- Inform the user that they have been infected?

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huh, of cos ask the sender to update/download anti-virus to fix it....

Or.. Send back a fix2001 virus to him for fun! (;o if you are virus spreader...)

Currently the most terrible virus is kak worm.. it will automatical run the script when you read the content..
it only take action on IE 5.0/ Outlook 5.0...

kak Take ActiveX Object: Scripting.FileSystemObject and also wsh to do some special job..
Well, although you should not make virus, the idea on window or application is useful...

- Kak Check the C:\Windows\Applic~1\Identity... and retrieve all {...} strings.. id..
What is that string mean?
Oh yes.. it is about outlook user data...
Then kak open regedit and add the spreading code part as signature of each outlook user...
HKEY_CURRENT_USER\Identities\ID\Software\outlook express 5.0\signature

finally, it check the day is 1st of month and hour of time is 5 PM..
then Shout a prompt it is Anti-M$... and call:
Rundll32.exe user.exe,ExitWindows to shutdown your PC...

There are many thing to learn.. including using javascript to handling string, substring...
create activex object and even execute command... ( of cos some should be fixed from M$ patch )