Is it possible to get admitted to a MS program with funding if I have a poor GPA but good GRE scores?
Before I begin to answer your question, let me elaborate that US and European universities typically do not have much funding available to students participating in a masters degree. Most funding options (in some universities all of them) are reserved for PhD students and for the universities that do offer funding for master students, it is usually awarded to a selected few. Furthermore, it is less common for European universities to offer funding (when compared to the US) but study cost in Europe can be much cheaper.

A poor undergraduate GPA alone does not prevent you from being accepted to a masters program. One can even hope to receive full funding if he can satisfy the admission committee that he is a fully capable student and his grades do not reflect his potential for being a graduate student.

However to be applicable for a fully funded masters program you will most likely need more than a good GRE score. Having the following can significantly increase your chances:


Good letters of recommendation from professors whom you've worked with and can vouch for you
Having related research experience (preferably with published results in a peer-reviewed journal)
Finding a professor (for your graduate supervisor) who has a highly matched research interest as you
Having related industry work experience
Preparing a compelling statement of purpose, providing convincing reasons for your poor undergraduate performance
Having a high TOEFL/IELTS score (for international applicants) 


In computer science, having valuable achievements in an internationally recognizable contest like the "ACM International Collegiate Programming Contest" can tremendously boost your chances of getting accepted (and funded) at even the top schools. However, even qualifying to participate in such a contest requires a strong background in programming and algorithms.

Final note. From my understanding, European universities are more sensitive to bad undergraduate GPAs and many have hard cut-offs which will eliminate you from the admission process without considering your application as a whole. Therefore, it is my personal recommendation to apply to US and Canadian universities alone as it will improve your chances and save you time and money.

Unfortunately even by having exact and complete knowledge of your GPA (which I don't), there is no way to be sure what your chances will be and parts of what is said above can be deemed opinion-based. The graduate admission process, from what I understand, is a complicated and nonlinear process with many different factors playing their part.