Harddisk problem my system not booting,it`s hanging up and showing press crtl-alrt-del for restart.

Depending on the Operating System you can uncompress your hard drive via command prompt or booting to a cd, if running windows 7 or 8 you have to reinstall

Have you tried a System Restore/Recovery? Can you boot to safe mode? Try the restore/Recovery procedure: Shut down, unplug, remove battery, plug in, push the on button and When Acer splash is on screen hold Alt and keep pressing F10...

go to the BIOS settings by pressing F2 or del key when you're on POST (exactly after you press the power button and the screen show up)
then look for "Boot device priority" that usually placed on Advanced Settings
Select the 1st boot device as your harddisk and then save&exit,restart your computer

There is a problem with the Microsoft Registration and Boot Manager has gone into protect mode.
This can be caused by someone trying to hack into the start up menu or just shut down incorrectly or even a corrupt file.
As the notebook finishes POST press F8 and select repair system. POST is where the notebook shows the first screen, before it boots up.
Hope this helps.

You have to change the BIOS settings to boot from your CD drive. It must have been set to boot from harddisk.
To do this you have to change the primary boot device from Harddisk to CD drive. When you restart your computer press DEL or F12 or TAB or F1(any one...Depends on your BIOS see manual or try all) to bring bios. In bios go to boot device priority and set the CD drive to boot first.
Restart your computer, it will boot from CD drive and XP setup will start.

Hope this will help...cheers:)

u need to format using a windows 98 sec boot disc. place the floppy in to the comp. switch on the comp. let the disc run, making sure your bios is set to boot floppy first. when disc is finished setting type fdisk then when finished delete drive by pressing 4 .add drive when finished by pressing 1 and following the insturctions. when finished press crtl+alt+del let the comp, reboot the when the disk as finished loading type format c: press yes let it run press crtl +alt+del again then take out floppy disc and put in winpx . as this sounds like you have a virus in your registery

Go to BIOS setting by pressing F2 or Del while booting..and change boot priority as first boot device as hard disk then save and exit...

Restart and tap the F11 key while booting

the ntldr.sys file is used to boot your winxp, this should have got corrupted, or your boot sector in the harddisk should have got corrupted.

what file system was used on your harddisk ( Fat32 or NTFS)

if it is Fat32 then you can try this. boot your system with win98 boot cd or floppy. after booting insert your windows xp cd in the cd drive copy the file ntldr.sys from the i386 folder to the os root dir(usually the c:) you will receive a overwrite message. do the over writing. thats all.
now restart your system normally (harddisk). it should be fine.

if the file system is NTFS, i am sorry to say, if you dont know the admin pass, you will have to repair the installation with the winxp cd,

for this boot your system with the winxp cd, on the first screen, press enter( for a fresh installation), then press F8, now you will be notified that there is already a window installation, on this screen press 'R' to repair the installation. follow the online screen.

Actually this is a nothing but just a reinstall of the OS. you may have to reinstall most of the os updates. and a few softwares also.

Hope this helps you.

go to bios and see there whether it is showing showing your hard disk or not if it is showing then re-install your XP again format your hard disk with the slow formating option,while re-installing it.