Laptop says that the driver is missing.

Just repair the os by booting the computer with the os and select repair..the os is corrupted

you are most likely getting a BSOD with a stop error code of 0x0000007B which is caused by the Windows XP CD that you are using doesn't have the SATA Hard Drive controller driver needed to recognize and utilize the hard drive. If Lenovo has XP drivers for this model then they should have a SATA driver (roughly 394k) that will need to be loaded FROM A FLOPPY DISKETTE during the boot to XP. (XP Requires the driver to either be slipstreamed into the CD or loaded from a floppy diskette. Trying to load the controller driver USB or a different CD will not work)
http://www.digitgeek.com/how-to-slipstream-sata-drivers-into-xp-cd/

Try to on your windows in safe mode by pressing F8 key when u swith on your laptop befor booting prosses u have press F8 key then u get servel option ther there is 1st option is safe mode select his option and press enter when your pc will be on in safe mode its take 10 to 15 min taking to load windows when u load or on in safe mode then u reset your PC then on it in a normal mode

Buy a registry cleaner and let it sort things out. If you changed operating systems, there are probably things left on that although they don't cause a conflict, cause a delay while being sorted. I use PA Tools, Registry Mechanic. This is just my personal preference. There are others that you may prefer.

Your trying to downgrade this means you have to use vista cd to format the hard driver, and after the laptop restart, load the Xp. Also sometimes this code comes if you donot use the original xp windows.

Thanks for using Fixy

I’m happy to help further over the phone at https://www.6ya.com/expert/mustafa_06f84c65ab5cc745

i hav hitachi hdd it has pass word and i have forget them is there any universal pass word i need them

Try to start in safe mode and then when it finished loading shut it down again. Boot again it should boot to windows if it not, maybe a corrupted files or some files are missing.

I take it you see the hard drive when you boot to vista cd. doing install can you remove partition and then create new partition format and install vista software. have you tried that if so sounds like your hard drive is working and can delete and reset drive partition index. if your crashing in post then you need to push the tab key when toshiba logo appears should switch showing post BIOS boot on screen all text you should try pressing the setup key as soon as you see the num loc light blink on your keyboard the driver is loaded press f2 then tab key to check post boot.
please let me if this helped you.

Most likely the hard drive went out, do you hear a clicking noise or loud ticking coming from the laptop?

Does it give you any kind of message like " NTLDR missing."?

Let me know.

the only thing I can sugust is remove norton 360 if you have this onboard and get other firewall and spyware and antivirus software.

and disable the sidebar with the widgets, and change desktop view from aero to clasic this will boost up loading and shutting down of laptop.

you can purschase vista, then download all drivers for laptop from manufactures and re-install from scratch.

good luck with problem