Goran, I had the same problem. Here is the solution:
In Windows XP go to: Control Panel > Regional Language Options > Click on “Customize” and change the “Decimal Symbol” from “,”
(coma) to “.” (dot).
This worked for me.
I am guessing you must have changed your regional and language settings from “English” to something else, just like I have.
I hope it helps.
Best,
Mateusz