Registry cleaners are definitely the shortest path to fix bad hard drive controller
errors and - most importantly - the safest when dealing with such a tricky operating system. There is an important fact to remember: even though anti-viral utilities can and do "kill" viruses, this software isn't able to repair the damage that those viruses breed in the registry system. Whichever problem(s) you encounter, always make sure that you have plenty of space on your hard disk since a lack of disk space can often lead to trouble. Though computers have become much less erratic in recent years, with so many advances in the field, it's still common (and still inconvenient) to encounter a variety of errors. Take care of your pc and maintain it properly; in the event that this care is lacking, you can expect to see assorted difficulties to deal with.