Registry error becomes critical when it gets corrupt badly, it is a very important part of Windows and if it is damaged then it may also corrupt the whole computer system. Sometimes it also gets corrupt and the system starts displaying an error message.
Due to its system gets slow and display registry errors. Registry repair and prevention are necessary because after some time this registry database becomes very large and so that the operating system faces difficulties finding anything or allocate a task. It stores all the activities that are executed over the computer system, this information makes a computer to perform better and efficiently with its hardware.
Windows registry or computer registry is actually the main database of any system in which all the information stored, this information plays a very important role to operate any computer system and its hardware.