I don't think that anyone here is going to be able to send you a perfect solution. Since no one here really knows your computer or what is on it. We can only suggest possible solutions.
What happened to me a number of years ago, was my computer started acting strangely. I suspected that it had a virus. I already had anti-virus software installed.
I knew about the date when things started to act strangely. I did a search for files as to when they had been modified or created around that date. Found some folders that were not associated with any programs in my computer. These folders kept getting bigger and bigger. The virus was literally filling my computer up with information that I did not need or want. What I did was I ERASED those folders. The problem then disappeared.
I did this with a program that is free. It is available from the following site. It is a safe program to download and use.
Eraser - Free secure data erase tool to wipe files on your hard drive
What I did concerning that virus may not work for all viruses. But, it is worth a try anyway.
If you choose to download ERASER, then what you need to do is right click on the folder that you think is the virus, and Erase should appear in the drop-down menu. Then left-click on Erase, and see what happens.