it might be able to run the games, but only on very low settings
AMD Athlon x4 740
4GB DDR3
MSI FM2-A55M-E33 (MS-7721)
500 GB
AMD Radeon HD 6850 Gigabyte edition
Win 10
Question is: Can my pc run games like overwatch, gta 5, the witcher 3 and many other games.. ?
it might be able to run the games, but only on very low settings
Unfortunately the computer will only be able to run on low, probably with low fps still. I'd invest in a new PC if I were you, you can get a nice computer built for around ~$700, which can run these games easily.