This is the v1 Halo Portable. It is roughly 77mb and does not require installation. All you need to do is save the file from the download and open it. This version is missing maps for multiplayer and does not contain the single player campaign.
size: 77mb
http://www.megaupload.com/?d=GU1ZCE02
or
http://web.mac.com/jimijam72/HaloPortable/Halo_Portable_V1_files/Halo%20Portable.exe
I RECOMMEND THIS ONE SINCE ALL MAPS ARE PLAYABLE
This is the v2 Halo Portable. It is roughly 500mb after installation. You should still save the installer file in case any errors occur. This version has all multiplayer settings enabled but does not contain the single player campaign.
size: 84mb
http://www.megaupload.com/?d=EC9XS0M3
or
http://web.mac.com/jimijam72/HaloPortable/Halo_Portable_V2_files/HPv2.exe
If you cannot see text in game from other players You need to download MSXML 4.0 SP2
This works with v1 and v2
http://www.microsoft.com/downloads/info.aspx?na=46&p=1&SrcDisplayLang=en&SrcCategoryId=&SrcFamilyId=3144b72b-b4f2-46da-b4b6-c5d7485f2b42&u=http://download.microsoft.com/download/9/6/5/9657c01e-107f-409c-baac-7d249561629c/msxml.msi
IT DOESNT HURT TO SAY THANKS