Now it worked! I downloaded three different versions of indigo and none of them were the correct one! Now, with the fourth try it works nicely!
Yeah...i'm stupid!><
Thank you so much for the help!

I'm sorry, i don't get it! >.<
I downloaded stable versions from the indigo website (three different versions actually) and none of them worked, all the same problem! Am I choosing the correct .exe file? Maybe i'm extracting the indigo .zip file to a "wrong" palce, (i placed it in "my documents" folder) C:\Users\me\Documents\indigo_v0.9.10
I also noticed what is written on the log.txt file in the indigo directory:
"Indigo Renderer v0.9.10 (0.9 Stable), Windows 32-bit Release build.
SSE present.
SSE2 present.
SSE3 present.
No scene file path specified.
Fatal Error: No scene file path specified."
Is that normal? Please, i don't know what to do anymore!!!

I'm having problems with skindigo!
Everytime i run sketchup, a window shows up asking for me to locate a .exe file. When i locate the indigo.exe on my indigo directory, an error message pops up:
"Error Loading File SkIndigo_1_0_9.rb
cannot convert nil into String"
I followed the installation instuctions correctly, and i downloaded skindigo v.1_0_9 and indigo_v0.9.10. What's going on? Any help?
The plugins menu in sketchup doesn't even show up...

PS: My sketchup version is google sketchup and it's not pro...and i use windows vista.