Ok I have a HP pavilion 742n desk top computer I recently ran scan disk and it took almost 2hrs to fix all the errors,I really don't run this very often so that may be why all the errors also I had some trouble uninstalling some software earthlink had me messing around in the registry to remove there junk,then had trouble installing some other software(systems suite utllites) This may also be part of all the errors. A friend of mine says he thinks I need a new H.D. due to all the errors.I ran a stress test thru ontrack system suite 5 and everything appers to be ok I ran scan disk every day for a week and have found no other errors.My question is 3 parts 1) how do I tell if I really do need to replace H.D. (it's 1 yr old ) 2)If so what site can I go to for instructions about doing it? 3)internal or external which is best?