Although you can easily handle hard disk that cannot boot problems - you can choose
from several possible methods; yet this is decidedly the one you need to get your computer operating at its best. You have to realize one thing: while antiviral software has the power to remove malicious files, they won't repair the mess that viruses give rise to in your registry. In order to amplify this point, these repair utilities do not handle the effects of malware, or the like - that's a job for a separate application which was developed especially for that function. Do you think that later versions of windows will utilize the registry system as we've become accustomed to it? Can the designers come up with something less vulnerable? Computers change rapidly these days, so virtually anything is possible. The information about windows could (and does) fill many books, nevertheless, i think that the information provided here is sufficient to get you on your way to error-free computing.