I have a dell latitude d610 lap top
Based on the build of a D610, I am assuming you're running Windows XP. I'm not sure your hardware can support Vista. That model was built before Vista was available.
That said, go to Start-Control Panel-User Accounts. Most likely a setting in there was changed, and my first thought is that it may have been after a Windows Update, in an effort to increase security.
See if the user you're trying to login with even shows on the list. If it does, click on it and change the password to <blank>.
If that user no longer shows then you will have to rebuild the profile for that user. I will caution you that if you have to rebuild the profile, you would want to make copies of the data attached to the old profile. You can do this from Windows Explorer. Start by making sure you can view all files. Then navigate to Local Disk C:-Documents and Settings, then to the folder for that username. Copy all of the folders and files to a safe place, like burn it to CD's or DVD's, or even to a flash drive. Do not save it to My Documents.
Sometimes the fastest way to rebuild the profile is to actually create a new one. Set it to administrator access. Then you can copy the contents of your old user's folders (but not the folders themselves) into the new user's folders.
Here's a recap:
Create a New User Profile in Windows XP
1. Log in as admin or an account with admin permissions.
2. Select the windows START button and click CONTROL PANEL
3. Click USER ACCOUNTS
4. Select CREATE A NEW ACCOUNT. You may need to select pick a task first
5. Type in a new name for the account
6. Click create account and ensure it is an admin account.
Copy Files to the New User Profile
1. Log on as a user other than the user whose profile you are copying files to or from.
2. In Windows Explorer, click Tools, click Folder Options, click the View tab, click Show hidden files and folders, click to clear the Hide protected operating system files check box, and then click OK.
3. Locate the C:\Documents and Settings\Old_Username folder, where C is the drive on which Windows XP is installed, and Old_Username is the name of the profile you want to copy user data from.
4. Press and hold down the CTRL key while you click each file and subfolder in this folder, except the following files: Ntuser.dat, Ntuser.dat.log, Ntuser.ini
5. On the Edit menu, click Copy.
6. Locate the C:\Documents and Settings\New_Username folder, where C is the drive on which Windows XP is installed, and New_Username is the name of the user profile that you created in the "Create a New User Profile" section.
7. On the Edit menu, click Paste.
8. Log off the computer, and then log on as the new user.
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