Network not working as soon as opening an app

[Microsoft Windows]

I really need help, my exams are within a month and I have to attempt my mock tests but I simply cant. My computer is very old around 10 years to 12 years and has windows 7 professional installed, amd athlon 7750 processor, I have my network adapter connected and driver installed on restarting comp, my internet connects and remains connected until I open or use anything that requires an internet connection like using chrome, as soon as I open chrome the network option goes with red cross over the signal type triangle in the bottom right of desktop and says " No connections are available" plea

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