Strange files malicious/infection?

Vista OS Home Premium
I have noticed the following 3 files in
C:\Windows

is-21L7U
Type of file .exe
Description: Setup/uninstall
File Version 51.50.0.0
size 680kb
No product name or sugnature

is-21L7U.lst
type of file: LST
size: 1kb


is-21L7U
Type of File: outlook item
size:10.2kb

I have scanned all o3 of these with Norton and Malwarebytes and they come up clean. I have ran a malwarebytes quick scan, SpyBot scan and a Norton scan and all come up clean

Are these files related to the installation of malwarebytes 1.42? It seems the time they are created are created 12/4/09 at 6:29am, which is the same date and time of mbam.exe (version 1.42) after I ran the update

So questions:
1. Are these files part of the mbam.exe 1.42 installation?
2. Why would mbam.exe put these files in C:\Windows and not C:\ProgramFiles?
3. Can I delete these since mbam.exe is now installed

I have googled these items and found nothing on them

Anyone else have these since the installation of malwarebytes 1.42?