There are several types of software that can slow down a computer, including resource-intensive applications, viruses, spyware, bloatware, and out-of-date system drivers. Resource-intensive applications and games, in particular, require lots of system resources such as RAM and CPU power and can slow your machine down significantly. Viruses and spyware can also use up valuable system resources to steal your data or damage your files. Bloatware are unwanted applications that may be pre-installed on your PC by the manufacturer, and they can cause slow start times and sluggish performance. Lastly, outdated system drivers can cause conflicts with newer applications and degrade system performance.