I bought a Free-dos computer with 128gb SSD and 1 TB HDD some time ago, installed Windows 10 on the SSD. After months of usage by many people, I question the security of the computer, I see sudden cpu, gpu and disk usage spikes, though I have Kaspersky and tried malwarebytes, I am still unsure of the computers security, I wanted to give it a frest start yet I have many important files inside the computer that I don't have any external storing place now.
My question is, if I were to completely erase windows 10 and re-install it, would it be a good solution for cleaning up (Format SSD) ? I want to store my files to HDD, I won't format HDD but given that the OS is reinstalled, there is no chance that HDD contains active viruses right ? Even if some application had some virus inside, it would need to be run first ? So I can extract safe files from it ?