Nwz/Shutterstock Old operating systems weren't built to run for months without shutting down like those of the 2020s. While there was no set rule for when you should restart them, you'd notice the system becoming sluggish if you hadn't done it in a while. For instance, programs would take longer to load, and software would become progressively unresponsive. One of the major problems was memory leaks – the slow buildup of unused memory due to programs "forgetting" to free the memory they no longer need. Modern operating systems handle problems like these better, and it's become more common to just put the PC to sleep or into hibernation to avoid dealing with the startup process constantly. While users have varying opinions on how often you should restart your PC, the general consensus is that you should do it at least once a week. Some suggest that you should restart your computer at the end of each day if you're a heavy user.…