How important is your PC Check up

How important is your PC’s health (PC Check up) for you now days? I personally think it seems it is not lesser important for many users than their own health as it affects the things directly in many ways. There are tasks today they are performed with the help of computer only and if they do not get done they may leave serious losses and bad consequences for one. For an instance somebody works from home, air ticket booking, bank transactions, sending important emails, share trading and other business purposes corresponding with others and entertainment etc. So a regular PC Check up is required so that we can perform our daily tasks smoothly and life should run smoothly.
Now the basic question arises here why does a PC Check up is needed and rather before that why does it go down? What are the possible causes be behind the scene and what we may do to prevent it or keep our PC healthy and fit? I would suggest here in a polite way to use your PC in safer way always… and this is the best solution and a word of caution before doing anything to improve PC health or PC Check up. Like do not browse any suspicious website or program you are not sure about, or do not insert any pen/flash drive into your computer unless it is scanned with an antivirus program etc.
However I have experienced that in spite of using a PC safely there may be occasions where the PC gets affected and a PC Check up is required. The reasons may be any I may describe them but protection is needed.
The main causes behind bad health of a PC or why does PC Check up is required.
A: - If a PC is infected with viruses or malware or any such malicious programs.
B: - Faulty hardware may also affect PC performance drastically and can produce many error messages on computers screen e.g. sometime if a RAM is faulty there may come a BSOD error message or there may be many other bad effects due to faulty hardware so keep you hardware up to date.
C: - Bad or corrupted drives in the PC can also affect PC’s health so they needs to be updated always.
D: - Damaged, missing files may also affect your PC clearly.
E: - Any software removals left in the PC may affect the normal functioning of your PC and can produce error messages. They also need to be checked in order keep your PC fit.
F: - If there are any obsolete programs in the PC they also affect the PC and should be eliminated if not required.
Apart from this use any updated antivirus program, and also you may use any freeware of anti malware programs, they are easily available and indeed keep PC Check up at maximum. Registry is one of the most crucial components of all windows PCs and it also needs to be fit and updated with rapid change of programs and PC environment.