Best pc configuration?

I have tried many maintenance softwares like Auslogic, Adv Sys Care,Ashampoo,Tune-Up and anti viruses stc like MSE,E-Scan,MBAM,Avira to keep my pc to its optimum. But could not get results. I think, after 6-7 years of use, my system has become old and ineffective. I have finally decided to buy a new one. I do not use gaming except inbui;t card games, but use DVD rom for seeing movies, listening songs etc. Can you suggest me best combination for my needs for motherboard, LCD monitor, RAM, Processor etc?