Hi @NGoud ,
Configure Quartus II to work with ModelSim-Altera in native link mode:
· On the Tools menu, click Options. The Options dialog box appears.
· In the General list, select EDA Tool Options.
· For ModelSim-Altera, type the path or browse to the directory containing ModelSim-Altera. The directory should be located under the Altera directory, e.g. C:\<Quartus installation directory>\\modelsim_ase\win32aloem
· Select OK.
Also try by stetting PATH environment variable PATH=C:\<Quartus installation directory>\modelsim_ase\win32aloem.
Which version and edition of quartus are you using?
Let me know if this has helped resolve the issue you are facing or if you need any further assistance.