These days keeping your registry clean is a lot easier than in the past when you had to open the Registry Editor (Click on Start - Run - type regedit and hit Enter) and find invalid and corrupted entries. That's why it's so important to keep the Windows registry junk-free and fix issues. Not to mention viruses that love to attack the registry and modify it to make your computer vulnerable and unstable.
As a result, Windows needs a lot more time to access the registry and your computer takes longer to respond. Such invalid entries accumulate over time. That clutters the registry with obsolete entries that point to non-existent software. However, some programs leave a lot of rubbish behind. When you uninstall a program, its registry entries get deleted as well. How do registry issues affect computer performance? That's why it's so important to keep the registry clean and well looked after. All this makes the registry a very complicated database.
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Programs access the registry thousands of times per second and new entries are created whenever you install new software or hardware. All that makes the registry the most vital, but also the most vulnerable part of a Windows computer. It contains all the data for all hardware, operating system software, all other applications, and all user settings (user profiles, installed software, the type of documents the users create, etc). The registry is a database that stores all Windows options and settings. What is the registry and why is it there?