Computer has a lot of problems, need to fix

Jan 18, 2019
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Hi, i have had this computer for over 4 years now and these sorts of things have never happened before. Here are a list of things wrong with my computer.
1. Super laggy when i open up any program
2. internet keeps shutting off by itself, need to restart to get it back
3. Cannot play any games with mods otherwise it will crash and delete any progress
4. On YouTube when i hover over the like button and things around that while watching a video the things stay there (only happens sometimes)
5. Takes a long time to start up and sometimes doesn't show task bar icons.
I am not sure if it is a virus or the computer is just to old to handle anything anymore.
If you have any suggestions it would be appreciated.