Can't run tests...illegal switch in RUBYOPT: -F (RuntimeError)

Does anyone have any insight into why this is happening?

C:\Users\Family\workspace\myapp>rake test
(in C:/Users/Family/workspace/myapp)
C:/Program Files/Ruby187/bin/ruby.exe: illegal switch in RUBYOPT: -F
(RuntimeError)
C:/Program Files/Ruby187/bin/ruby.exe: illegal switch in RUBYOPT: -F
(RuntimeError)
C:/Program Files/Ruby187/bin/ruby.exe: illegal switch in RUBYOPT: -F
(RuntimeError)
Errors running test:units, test:functionals, test:integration!

I'm in Rails 3...

Thanks to this guy here ...

http://pledgie.com/campaigns/14034?

(you should donate! thorough rails 3 documentation would be great!)

...I came to an answer.

My problem was that I'm on Windows, and I installed ruby in the
program files directory. big mistake. the "F" is getting interpreted
because of the space in "Program Files"!
I had to reinstall Ruby right in C: like i should have (so it's C:/
Ruby). This also meant I had to reinstall RubyGems and Rails, but
hey, you have to tear a building down if it was built wrong in the
first place.

Thanks again to Ryan Bigg.