I reinstalled Java, Eclipse and then Quartus but still in my Windows computer the Eclipse-nios II wont start. I even reset my Windows PC and reinstalled everything again.
Please read my post here:
Home>FPGA Developers>FPGA Embedded Systems>Nios® II Embedded Design Suite (EDS)
'No templates available after inserting SPOC info file'
After following all the installation steps, the problem with not starting Eclipse-nios II from Quartus was also solved.
I hope it will help you too.