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PLEASE HELP!!!  I forgot the operating systems password--I'm trying to reinstall windows

Posted on 2003-11-10
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Last Modified: 2013-12-04
I'm trying to reinstall windows 98 on my daughters pc because when I start up her pc I first get this message, "B: Drive Error  Press F1 to Resume."  So I press "F1" and Windows starts to open but then I get the following message, "Cannot find WIN.COM."  So I used my Windows 98 startup disk and CD to reinstall windows 98 but during installation a small black window popped up and asked "BootSector Write !!  VIRUS: Continue (Y/N)?."  I tried typing "Y" or "N," I hit "Enter" and "Esc" and I clicked on the "Y" but nothing happens.  It's like the window is frozen but my mouse still works.  So I tried to get into my bios so to disable any virus protection but in order to get to setup I need a password.  I forgot the operating system's password.  I've tried every password I've ever used but to no avail...help.
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Question by:mrwil
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CrazyOne earned 125 total points
Comment Utility
See if this helps

Most of these are bootable floppies that give you a backdoor to the SAM registry hive and allows you change the admins password.

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Free stuff

Instructions
This is a utility to (re)set the password of any user that has a valid (local) account on your NT system, by modifying  the crypted password in the registrys SAM file.
http://home.eunet.no/~pnordahl/ntpasswd/bootdisk.html
image files
http://home.eunet.no/~pnordahl/ntpasswd/bd030426.zip (1.4MB) - Bootdisk image, date 030426
http://home.eunet.no/~pnordahl/ntpasswd/sc030426.zip (~750KB) - SCSI-drivers (030426)
The unzipped image (bdxxxxxx.bin) is a block-to-block representation of the actual floppy, and the file cannot simply be copied to the floppy. Special tools must be used to write it block by block. For Dos, win95/98 & NT, use rawrite2.exe or some other imagewriter:
http://home.eunet.no/~pnordahl/ntpasswd/rawrite2.zip - DOS Program to write floppy images.

http://home.eunet.no/~pnordahl/ntpasswd/cd030426.zip (2MB) - Bootable CD image with same version and drivers as floppies above.

Previous versions (this uses the old NTFS driver, can try this if the new one won't work):
http://home.eunet.no/~pnordahl/ntpasswd/bd011022.zip (1.4MB - Bootdisk image, date 011022)
http://home.eunet.no/~pnordahl/ntpasswd/sc011022.zip (~700KB) - SCSI-drivers (011022) (only use newest drivers with newest bootdisk, this one works with bd011022)
====================

Another one
Change administrator password on NT/2000, without knowing it!!! Bootdisk...
http://www.thomasmathiesen.com/itak/html/software.html
image file
http://www.thomasmathiesen.com/filez/sw/external/linuxbootimage.zip
image writer
http://www.thomasmathiesen.com/filez/sw/external/imagewriter.zip
====================

Another one
Offline NT Password and Registry Editor
http://www.pc-pipeline.com/modules.php?op=modload&name=Downloads&file=index&req=viewdownload&cid=3

Download it here
http://www.pc-pipeline.com/modules.php?op=modload&name=Downloads&file=index&req=getit&lid=6

Run it to create a boot floppy then follow the instructions. If you choose to do this then you are doing this at your own risk. Just change the admin pw and login then change the account pw's that you desire.

Make sure you have a floppy disk in the floppy drive and let the program create the boot floppy. Now restart the machine a let it boot from the floppy. Now follow what it instructs you to do.

Use it like a bootdisk.

Another one
NTFS/FAT Boot disk for password recovery/reset
http://www.pchelplive.com/modules.php?name=Downloads
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NTAccess can replace the administrator password of a Windows XP, Windows NT or Windows 2000 system by rebooting the computer with a special set of boot disks or CD-ROM (XP only). This is useful if you forgot the administrator password and cannot access the Windows XP/2000/NT system.
http://www.sunbeltsoftware.com/product.cfm?id=265


The Password Auditing and Recovery Application
http://www.atstake.com/research/lc/index.html

L0phtCrack, The integrated password cracker for NT
http://www.securiteam.com/tools/L0phtCrack__The_integrated_password_cracker_for_NT.html

ERD Commander
http://www.winternals.com/products/repairandrecovery/erdcommander2002.asp

When your server or workstation won't boot, you need ERD Commander 2002. ERD Commander 2002 boots dead systems directly from CD into a Windows-like environment. You'll have full access to the dead system's volumes, so you can diagnose and repair problems using tools located on the ERD Commander 2002 Start menu. And you'll have built-in network access to safely move data off of, or on to, the dead system. With ERD Commander 2002 you can repair a system quickly and easily, saving you time and rescuing your critical data.
--------------------------------------

Or you could, if you have a FAT32 file system, just boot to a Win98 bootdisk and rename the SAM file (registry Hive) in the C:\WINNT\system32\config folder to something else. Of course this will remove all accounts on the system and you will need to rebuild them. If you are using NTFS then boot to the Win2000 CD and do this from the Recovery console.

For XP
Windows XP Tip: Password Recovery Disk
Take preventive measures against losing user-level passwords
http://www.techtv.com/callforhelp/answerstips/story/0,24330,3356093,00.html


The Crazy One
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by:CrazyOne
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How to Bypass BIOS Passwords
http://www.labmice.net/articles/BIOS_hack.htm

There is lot of info on at the above link these are just the basic things to try

Using the Motherboard "Clear CMOS" Jumper or Dipswitch settings

Many motherboards feature a set of jumpers or dipswitches that will clear the CMOS and wipe all of the custom settings including BIOS passwords. The locations of these jumpers / dipswitches will vary depending on the motherboard manufacturer and ideally you should always refer to the motherboard or computer manufacturers documentation. If the documentation is unavailable, the jumpers/dipswitches can sometimes be found along the edge of the motherboard, next to the CMOS battery, or near the processor. Some manufacturers may label the jumper / dipswitch  CLEAR - CLEAR CMOS - CLR - CLRPWD - PASSWD - PASSWORD - PWD. On laptop computers, the dipswitches are usually found under the keyboard or within a compartment at the bottom of the laptop.  
Please remember to unplug your PC and use a grounding strip before reaching into your PC and touching the motherboard. Once you locate and rest the jumper switches,  turn the computer on and check if the password has been cleared. If it has, turn the computer off and return the jumpers or dipswitches to its original position.
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Removing the CMOS Battery

The CMOS settings on most systems are buffered by a small battery that is attached to the motherboard. (It looks like a small watch battery). If you unplug the PC and remove the battery for 10-15 minutes, the CMOS may reset itself and the password should be blank. (Along with any other machine specific settings, so be sure you are familiar with manually reconfiguring the BIOS settings before you do this.) Some manufacturers backup the power to the CMOS chipset by using a capacitor, so if your first attempt fails, leave the battery out (with the system unplugged) for at least 24 hours. Some batteries are actually soldered onto the motherboard making this task more difficult. Unsoldering the battery incorrectly may damage your motherboard and other components, so please don't attempt this if you are inexperienced. Another option may be to remove the CMOS chip from the motherboard for a period of time.  
Note: Removing the battery to reset the CMOS will not work for all PC's, and almost all of the newer laptops store their BIOS passwords in a manner which does not require continuous power, so removing the CMOS battery may not work at all.  IBM Thinkpad laptops lock the hard drive as well as the BIOS when the supervisor password is set. If you reset the BIOS password, but cannot reset the hard drive password, you may not be able to access the drive and it will remain locked, even if you place it in a new laptop. IBM Thinkpads have special jumper switches on the motherboard, and these should be used to reset the system.
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Overloading the KeyBoard Buffer

On some older computer systems, you can force the CMOS to enter its setup screen on boot by overloading the keyboard buffer. This can be done by booting with the keyboard or mouse unattached to the systems, or on some systems by hitting the ESC key over 100 times in rapid succession.
===============

Other items at that link

Backdoor passwords

Jumping the Solder Beads on the CMOS

Using a professional service

Links to Motherboard Manufacturers
==============

A couple of other links to look at

http://www.elfqrin.com/docs/biospw.html
http://users.powernet.co.uk/sysserv/page125.html
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