Corrupt system files, account lockouts, and accidentally deleted data are three scary computer problems that often send people running for their backup drives. While restoring a backup may technically fix things, a full system backup is usually a very time-consuming overkill in these cases, and nobody likes the time-warp effect of restoring one (e.g., if your last full backup ran a week ago). When these problems occur, fixing them can be far simpler than you might think.
Problem 1: Corrupted System Files – Unable to Load the Operating System
A sudden power outage or system crash can corrupt files that are part of your operating system’s essential guts. When these things happen, people who have backups tend to just jump straight to them, but then we’re at the time warp problem—if you’ve already done a week’s worth of work since the last backup, that data is lost. Instead, you should first attempt to repair or restore just the system files.
Both Windows and Mac OS X have these capabilities either built in, or on their install discs. Good preparedness doesn’t just mean making backups, but also making sure these discs are safe—they can save you some major heartache.
Solution:
Windows: Corrupt system files happen a bit more frequently in Windows, but it’s not difficult to fix most of the time. You should make use of Windows’ built-in System Restore, which basically makes daily, miniature backups of your system. It doesn’t touch your data—it just backs up system files, so it’s absolutely perfect for these sorts of problems. If you’re able to boot your PC into Safe Mode (pressing F8 while booting up should do the trick), you can find System Restore in the System Properties settings. If your PC won’t boot all the way into Safe Mode, then you’ll need your Windows install disc. Booting into that disc will give you the option to use System Restore right on the spot. Since it runs on a daily basis, you can even choose how recent of a snapshot you want (just in case you think the problem started a couple of days before everything stopped working).

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