Well yeah, I can't take credit for this... but I sure can post the bloody thing!
1) Click Start > Run, Then type Regedit
2) Click on "HKEY_CURRENT_USER"
3) Click "Software"
4) Click "Valve"
5) Click "Steam"
6) Click "Users"
7) Then under "Users" there will be numbers. Open your calculator type in the number you see. Then divide by 2. That is your Steam ID.
! C:\Documents and Settings\user.DAMON-ROOM\Local Settings\Temp\SteamID.zip: The archive is either in unknown format or damaged
! Cannot execute "C:\DOCUME~1\USER~1.DAM\LOCALS~1\Temp\Rar$EX02.953\SteamID.exe"