Password problem and virus problem

hi there.
Method 1 - Reset password from another Administrator account:

1. Log on to Windows by using an Administrator account that has a password that you remember. ...
2. Click Start.
3. Click Run.
4. In the Open box, type "control userpasswords2?.
5. Click Ok.
6. Click the user account that you forgot the password for.
7. Click Reset Password.

More items...

I FORGOT MY ADMINISTRATOR PASSWORD ! - HP Support Forum ...

https://h30434.www3.hp.com/...Recovery/...ADMINISTRATOR-PASSWORD/.../24703...
if this does not work go to this link and read up some more.
Recover administrative password Google Search

Hiren's Boot CD is the best

http://www.hirensbootcd.org/resetting-windows-password/

Boot your computer form the original system disk, open Disk Utility from the top menu. Disk Utility will then give you the option to reset your password.

Lost Windows password:

• Log in as Administrator (try safe mode if you don't see Administrator).
  
• Login as other user (if other user is availible) and manage users.
  
• Reformat computer.
  
• Use 3rd party software to remove password. Like http://www.top-password.com/reset-windows-password.html
  

Click start run type cmd press Enter

black screen should open DOS mode

this will vary depending on your operating system

type in net user username

For eg. If you want to change administrator password , type net user Administrator

it will prompt you to enter the new password

enter the new password and the password is changed

hope this helps

Forgot your Windows password? Don't worry - it happens to a lot
of people.Vista and Windows 7 allow you to create a password reset
disk.If you installed Windows XP, boot up Windows XP in Safe Mode and
log on with the built-in administrator account.Besides,using Windows
Password Reset Deluxe is a good method.

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.

Hack HP Computer Password ' Erase HP Desktop / Laptop Password Without Being a Hacker

• In my received E-mail that people ask to recover lost PC password, a quarter of people are using HP computers. So I prepare this tutorial specially for these HP users.

I know a windows password recovery tool called windows password buster. This software could help you recover the password.