What is the recommended solution if a computer performs slowly?

The recommended solution involves uninstalling unused programs and installing additional RAM to enhance a computer's performance. When a computer operates slowly, it may be struggling due to insufficient memory (RAM), which is crucial for running applications smoothly. Increasing the amount of RAM can allow for more applications to run simultaneously without slowing down the system, as it enables the computer to manage tasks more efficiently.

Additionally, uninstalling unused programs frees up valuable resources that can otherwise consume processor power and memory, contributing to sluggishness. By removing software that is not actively being used, you help streamline the operating system’s operations, which can lead to an overall improvement in the computer's speed and responsiveness.

Other options, such as increasing hard disk space, do not directly address the issues of slow performance because having more disk storage does not necessarily enhance the speed at which the computer operates. Running more applications would likely worsen the problem by further taxing the system, and changing the operating system may require significant time and effort without guaranteeing improved speed if hardware limitations are the root cause.