Anyone recognise firewal1.exe?

Dear kind people,
I started downloading Spybot from MajorGeeks last night, and at the end of the download process I had a message from my installed Norton anti virus that Norton had quarantined a worm in the Spybot (very odd - I have downloaded this twice before from MajorGeeks without this message). Anyway, I philosphically hoped for the best. However, today on running Spybot have this message -
Spybot Search and Destroy -
Category: System Startup global entry.
Change: Value added.
Entry: Windows Firewall.
New data: firewal1.exe

Now this may be perfectly legitimate, so I do not know how to respond - Allow change or Deny change. No further info is available. I am leaving this hanging until someone can give me some advice ---- pleeease!

Thanks for any advice!
Eve