Fragmented Hard DriveOne of the most common causes of a slow computer is a fragmented hard disk drive. Checking the disk for fragmented data won't take too long and can help with dealing with slow performance issues. In Windows 7, open Start > All Programs > Accessories > System Tools > Disk Defragmenter.
Too Many Permanent Temporary FilesTemporary folders are supposed to make using Windows and your browser faster by providing easily accessed files that can be loaded up quickly.
When your hard disk drive becomes over 90% full you will find that performance drops. In order to fight this, one of the best things you can do is delete your Windows temporary files. While deleting your Internet history and temporary Internet files is something you can do from your browser, CCleaner is a good option for tidying up the Windows temp folders.
System StartupBooting Windows typically takes around the same length of time on any computer. As you install software to your PC, any that is required to launch as part of the Windows startup will result in poor performance of your computer, and perhaps even freeze your computer.
To fix this you will need to reduce the number of applications that are loading at the startup.
Viruses & SpywareMalicious software is one of the main reasons for slow or poor system performance, and can add themselves to your computer while you install software downloaded from the web. Malware doesn't just come in the form of viruses, worms and Trojans.
You can deal with malicious software by ensuring that your computer is fully equipped with anti-virus.
Old HardwareOld hardware can prove deadly to your computer. It's a familiar tale - the computer bought years ago slowly upgraded component-by-component until it eventually has all brand new shining parts that simply cannot hope to perform as intended.
The Windows Registry is like a database of filepaths and instructions for the operating system and installed software, and it can become corrupted and overloaded. These issues will cause slow boots, poor performance and a very slow shut down. You can CCleaner to fight this problem.
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