It is important that you always check if your computer is safe. Just imagine if it isn’t safe. There may be some viruses that are already getting information from your computer. The details that you have on your computer are very personal. You do not want people to just steal your identity. The moment that there are some keys that do not work on your keyboard, you need to double check if your keyboard is not just having some issues.
If you are sure that your keyboard is supposed to work, you can do letter B. You can use an anti-virus software that can scan if there are some viruses that are lurking beneath your programs and so much more.