This tecnique can only work when your account name moust not
be administrator.ok
When windows starts and account screen appears then press
control+alt+delete then it will show you a screen then in
username box type Administrator and during xp installation
windows will ask a administrator password if you had set a
password on that administrator account then in Password box
type that password if there is no password then leave it
blank and press ENTER then everything is ok .From that
account you can edit your previous account.
Note:- Your account of which you forgot the password must
not be named as administrator ,the username must be change.
I think you can understand.

Resetting your administrator password when forgotten it 
with out loosing your data.
keep the windows cd in the cd drive and restart the pc, 
boot with cd drive like when you perform a format of pc. 
then select second repair(second time when repair option 
occur) when it comes to 33 mins just press shift F10 
continuesly then cmd prompt will open there you type 
nusrmgr.cpl it will go to user accounts there you can reset 
your administrator password also.

There are many ways you can hide your IP. by using a proxy 
or using (third party) program like smarthide.

Through group policy we can set the wallpaper for all users 
in doamin. Suppose if new user login at the first time they 
can also get same wallpaper and this is not allowed the 
change the wallpaper except system administrator.or we also 
need change registry value as follows :
In Regedit :

HKEY_USERS\.DEFAULT\Control Panel\Desktop-right side 
wallpaper (here assign name of the wallpaper)

win xp has no firewall option and winxp sp2 has firewall 
option

1 First take a bootable OS cd insert into cd rom
2 set first bootable device as cdrom
3 select drive on which you want to install OS
4 select the File System 
5 It starts installing OS it may take 30 to 40 mins depend
on System configuration.

Some of the preliminary steps include the following:

Backing up system data.

Removing users and jobs from the system.

Storing to tape any system files that you wish to maintain.

Once you are ready to begin the installation proper, the 
following are required steps of the process:

Installing from the system load tape.

Restoring the FOS tape.

Restoring the SUBSYS tape.

Creating a customized system load tape.

Updating with the customized system load tape.

Restoring user files, if any.

Starting system for normal operation.

what is latest os of microsoft,how window vista differ from 
window xp

1. Vista has a bitlocker option but xp doest have it.
   bit locker:
       Bitlocker drive encryption,
       Bitlocker on volume
       Prevents hard drive from hackers

2. Vista has windows defender tool which prevents spyware 
and unwanted software installation, but xp doesnt has it

3. Windows Vista has Parental control Feature Windows XP 
has No Parental control Feature
- This option enables parents to restrict
Children’s which sites, games .software
to use & not

if you have one (DC)domain controller and anohter is(ADC) 
additonal domain controller,now as per your qusetion if DC 
is down and ADC power is on,it'll take control that time 
but on ADC you to create global catalog server.
ADC'll give 24 hrs services after that it won't.
before 24 hrs make this ADC as a DC.
for this you need to seize the FSMO roles.

netbios name is the network basic input and output servies 
it is just like DNS in 2000  and 2003 servers. it is used 
for hostname resolution in prewindows systems.

NETBIOS name its funactionality is similar to DNS in 
windows 2000/2003 server. The NETBIOS used in window NT 
server for name resolation like ip to name or vice versa.

NetBIOS:-
The original networking protocol for DOS and Windows PCs. 
NetBIOS packets did not contain a network address and were 
not easily routable between networks. As a result, the 
interface to NetBIOS and the transport part of NetBIOS were 
later separated so that NetBIOS applications could use 
routable protocols such as TCP/IP and SPX/IPX. The 
programming interface (API) retained the NetBIOS name, 
while the transport protocol was renamed NetBEUI 
(pronounced "net-boo-ee").

Name Resolution

Today, NetBIOS is used to support legacy NetBIOS 
applications but is also widely used for NetBIOS name 
resolution. Since NetBIOS was the first major standard for 
PC networks, computers were named according to the NetBIOS 
format, which identifies a machine by a unique 15-character 
name. NetBIOS machines periodically broadcast their names 
over the network so that Network Neighborhood or My Network 
Places can catalog them.