Why is my computer so slow? Background Programs One of the most common reasons for a slow computer are programs running in the background. Remove or disable any startup programs that automatically start each time the computer boots. (To see what programs are running in the background and how much memory and CPU they are using, open Task Manager. If you are running Windows 7 or higher, run Resmon to get a better understanding of how your computer is being used.) If you have an antivirus scanner on the computer, spyware protection program, or another security utility, make sure it is not scanning your computer in the background. If a scan is in progress, it can decrease the overall performance of your computer. If this is the case, allow the scan to complete, and the computer performance should improve. computer so slow Hard Drive Verify that there is at least 500-600MB of free hard drive space. This available space allows the computer to have room for the swap file to inc...
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