I have to present a poster in two weeks and data analysis is going nowhere
Don't worry. Poster presentations often showcase early work that needs further development. Think of it as a beta test to get some feedback, in order to develop a complete product. Negative results are also results, and they help deciding future directions of work.

You could mention what you attempted to do/prove, and why that would be important. List out what approach/analysis worked and didn't work,. You could spend time understanding why those things worked/didn't work, and put those on your poster. Based on these learnings, you could chalk out some directions for future work.