It may take a couple of hours to run depending on hard drive size. It sounds like bad clusters is your problem. 5 year old hard drives have been known to crap out, but CHKDSK may be able to extend its life for a while. I'd back up any data I wanted to keep as soon as possible though.
Good luck.
Someone said to post it here.Some times it wil let me log on and sometimes not.Since its a hardware problem. Its a windows 2002 xp. Sony. It has vaio written on it.The hard drive box. Its like 5 years old. Pcvrz24g is written on it. What do I need to do?What else do I need to give you in order to fix this?

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