There are many causes of a slow PC and knowing these causes is the first step in trying to make your computer faster. A slow PC can be as a result of the hard disk drive that is full with unnecessary and malicious files. Another cause of a slow PC is when you have several software that have been installed or uninstalled in your computer thereby leaving behind some malicious files or may confuse the software. Your computer run slowly when there is corruption of data, PC is overheating; corrupt OS, bad hardware, or when there are Windows updates missing or outdated drivers.
In order to make your computer faster, you need to check wherever there is sufficient space in the hard disk drive. You need to verify that there is at least 200-500MB of free hard disk space in order to allow your machine to have room for the swap file and increase n size and to make room for the temporary files. If the hard drive is corrupted or fragmented, you need to run Scan-disk or anything equivalent in order to help in ensuring that there is nothing physically wrong with the hard disk drive of your machine. Furthermore, you need to run De-frag to ensure that your data is arranged in the best order.
Another thing that you need to do to speed up your PC is to look for background programs. You need to disable or remove completely any program or TSRs that start automatically every time your PC boots. If you want to find out what programs are running in the background, their CPU usage or how much memory they are consuming, you need to open the Task Manager. In case you are running Windows 7, you may be required to run Resmon to establish the programs that are taking up a lot of space.
Moreover, you need to verify that the Device Manager is completely out of conflict. You are expected to look at the hardware conflict and if there is any conflict, you need to resolve these issues as they may be the causes of your PC running slowly. Doing the above things will ensure that you have a clean registry.