If your computer's CPU, motherboard, and Windows OS have huge security problems which the maker of your computer, Windows, and computer hardware company won't fix, it is a good idea to not use the computer, so you wont get hacked by a hacker or virus which uses the unfixed security problem on your unfixed PC to hack your computer. I think some banks, stores, schools, and security concerned PC users may get rid of their unsecure computers if it has a very bad security problem like Intel's Spectre and Meltdown CPU security problem which Intel won't release a fix for older CPUs like the Pentium 4. Microsoft also won't release a patch for Spectre and Meltdown for Windows Vista, XP and older operating systems. Some CPU which get the Spectre and Meltdown patch may become slower making the CPU unusable for some more demanding users who are heavy CPU users. Some patches for Intel CPU security problem have broken a PC because Intel and Microsoft released a defective patch to users. I think users with a slow CPU caused by the Spectre and Meltdown patches may need to upgrade to a faster CPU, and motherboard if the new CPU is not compatible with the old motherboard. Users may have a harder time selling their old computers if the computers has a non-secure CPU and other un-secure parts and Operating system which won't get patched of security problems like Intel Spectre and Meltdown problems. The most likely thing to do with a less secure computer is to recycle it, or use it for a less important task like playing offline games, listening to music and watching video files rather than using it for online banking, school, and storing important files which you don't want hackers to steal.