I'm format using windows xp sp2 my laptop hp 530 using my computer. i exctract my laptop hdd and connect my computer and then format hdd. but i reinstall hdd in my laptop he shwon me "error loading operating system". how can i do... vijay soni jaipur

Run a HDD Test

Restart Computer -> Immediately keep tapping F10 Key which is on 1st row of Keyboard

Go to diagnostics with your arrow keys

Go to Primary HDD Test -> Press Enter ->

See the Test result

If Fail then Contact HP for Replacement of HDD or Service

I assume you are attempting a "downgrade" to Xp from Vista, since this laptop does not come with XP.
From the Compaq information page:

1. HP does NOT support XP for consumer notebooks, so if you have any difficulties regarding XP, do not expect HP will help you.
2. HP may demand you to install back VISTA if you have hardware problem to troubleshoot it.
   An option to consider-put your original Vista hdd away and install new one for XP.
3. Some of the notebook features may not work in XP due to uncertified licenses pointed in this guide.
4. Microsoft has released three (3) Service Packs for XP, use only SP2 for the first trial. Why? Since many of XP drivers are released based on XP-SP2.
5. Always make Vista Recovery cd/dvd before downgrade to XP. see it here
6. You have a folder with drivers & programs that may prove very helpful after XP downgrade.
   Copy folder C:\Swsetup to DVD Before formatting your hdd.
7. If you have a pre-SP2 XP cd, get the full SP to Integrate with Nlite: SP2 Nlite HERE

The help guide for downgrading is here. There is a lot of information on this process written there.

However, if what you want is a an XP look and feel so you can compute the way you used to, change the Vista to look like XP in the display properties.
If you are trying to run non-Vista software, try running it in compatibility mode. To do this, right click on the program files and select properties and then locate compatibility..

all u need to do just enter either "Delete" or "F2" button when u turn on ur computer then go to bios section and change the boot sequence to CD-ROM first then save and exit
aftert that put in ur CD-ROM any bootable windows xp cd then it boot by itself then follow the instruction to format it and install new O/S

Step 1.

Step 2.

Its true. the Bios or HDD driver wont allow you to install Win XP on it.. This BIOS is compatible with only Win Vista. The only easy way to do it is by creating 2 partitions while installing vista. once vista is installed- install XP with Dual boot and than format the vista partition.

Enter your model number here.. (remove the space in the url)

http://welcome.hp.c om/country/uk/en/welcome.html#Support

1 - Place CD in the Drive
2 - Restart PC and go into Bios by pressing Del, F2 or whatever instruction the start up screen says.

3 - Go to Boot configuration and set it to Boot from CD
4 - Save and Exit
5 - Follow onscreen instructions untill you get to the Windows install screen.
6 - You may have to create a partition (Drive Letter) on your hard drive if nothing was there before, you can assign as much hard drive space as you want to this. If your not sure just use all the space available. This will be your C drive.
7 - Pick the drive you just created and install windows on it using the on screen menu. It will ask you if to format the drive, say yes and use NTFS not FAT as NTFS has more features.
8 - Just say yes to all questions asked after this point.

When windows is installed it will ask you for a CD key and to activate by going on the net, I'm afraid I can't help you with this.

Place cd into drive.Keep pressing enter until the computer reads the cd.Follow the directions on the screen. That is all their is too it. How did you get an HP without an operating system having been installed? thsi is a windows disk, correct? Not a reinstall disk?Should work the same either way.  If it gives yuo an error or doesn;t work please tell us what happened and we will direct you more. Thanks  

http://h20000.www2.hp.com/bizsupport/TechSupport/Home.jsp?lang=en&cc=us&prodTypeId=321957&prodSeriesId=3375953&submit.y=2&submit.x=7〈=en&cc=us

uninstall sp3,
take hdd to another machine,
recover the files and programes you want to save,
back them up on disk,ie,external drive or dvd data stores 4.7b gb per disk,
format start again and only load xp sp2.
Xp sp3 has bug fixes apparantly,lol
why fix some thing if its not broken I say.

what exact error do you get ?