I have a hard drive does show error in one computer but not on the other. It has XP on it. The error is something like this, " The disk maybe damage or infected with virus. Please restart windows and run CHKDSK." The error is displayed after the Dell logo. I have been using this particular disk in my primary computer I am using. Last week I have to swap it to my other computer and worked since I was fixing something in my primary computer. Then I returned back the disk to my primary system and this is when I see the message. I swap it with the disk I used in the other system and it was fine. The error only happen when I return the disk to the original system. I even plan to just reinstall and reformat the drive but it would not let me.  Any suggestion? Thanks.