The Disk is write-protected. Remove the write-protection

If your computer is connected to a network or the Internet, it is advisable to use computer security tools, such as a firewall, to protect your computer from unauthorized access or viruses. Windows operating systems come with a built-in firewall, malware protection and Internet security. These settings are automatically configured to the factory's default settings when you purchase the operating system. To alter the settings for these security features, access the Windows Security utility through your system's Control Panel.

Open the "Windows Security" utility by opening your "Start" menu and selecting the "Control Panel" option on the right-hand side. Windows XP users can click on the "Security Center" link in this window. For Vista users, click on the "Security" option, and then click on "Windows Security Center." Click on the "Windows Firewall" option to change the settings for your firewall, if you are using XP. You can turn the firewall on or off, and also configure which programs are allowed through the firewall. Vista users should click on the "Windows Firewall" link in the left window pane and click on the "Change settings" link. In this window, you can block programs from passing through your firewall and grant access to new programs. Click the "Internet Options" selection to configure your Internet security settings. You can raise or lower the security level for different zones using preset configurations, or you can create a custom security level. You can also reset the Internet security level to its default settings. Click on "Automatic Updating" in the Windows Security Center to configure your system's update settings. In Vista operating systems, click on "Windows Update" and "Change Settings." You can configure your update settings to automatically check for updates daily or weekly. You can also set a convenient time for your system to update to prevent interruption. Automatic updating can be turned off by selecting the corresponding option toward the bottom of the window. Select the "Malware Protection" option to edit malware settings if you are using Vista. This option is not available in XP's version of Windows Security Center. You can turn the malware protection programs on or off using the arrow to the right of the "Malware Protection" bar. Click the "X" button to exit Windows Security Settings.

Here I collect some popular solutions to help reset HP laptop password if your laptop installed Windows system such as Windows 7/Vista/XP.
Solution 1 Reset HP laptop password by another user account with administrator privilege.
Solution 2 Reset HP laptop password with Offline Windows Password & Registry Editor.
Solution 3 Reset HP password with professional password recovery tool.
If you do not have another administrator account on HP laptop or you have little experience in Windows or LUNIX operations, you can use Windows Password Rescuer to help reset HP password without lose date. This software was provided by DAOSSOFT corperation, it supports HP laptop password recovery in Windows 7/Vista/XP and HP computer installed Windows 7/Vista/XP/2008/2003/2000.

Reset Administrator Password ' Free and Fast Methods to Reset Administrator Password

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Make an clean installation of Win 7 and repartition your Hard disk.Use Genuine Windows 7 to avoid blue screen error.AVG 2011 is a very good antivirus.Use Hard disk sanitizer given in Bios settings.Use Tune up utilities 2011or System mechanic latest version.I think your problem will be solved

my pendrive is write protected how to format it ,it says that the disk is write protected and i can read the content in it but cant delete the contents what should i do to remove the problem--ATUL

You might be still covered under extended warranty, check here

I don't know what OS your HP laptop is installed with.

If it is Windows 8, Windows Password Hint, PIN code, Microsoft account can be used to login HP laptop. After logon successfully, change, recover or reset Windows 8 password is available.

If it is Windows 7, Password hint or another administrator account may help you. But if you don't have all of these, try password reset disk. Create it before Windows 8 locked or with Windows 8 Password Recovery tool is OK.
Besides these, Chntpw USB disk also works for Windows 7/Vista etc.

Your pendrive is infected with Autorun.inf virus
to remove this virus install malwarebytes (It is antimalware software)and scan your whole computer as well as your pendrive when you scaning finish remove all threats

IF the above method is not work

Try to format in other operating system like windows vista or in windows 7 because in vista and 7 you can force format your pendrive

have your computer reset and reinstall the operating system.. the software is corrupted

I have a compaq 6720s and I cannot remember my power on password to get into my system. Please help me. I do no know what to do.

Thanks Cherry