unable to run computer

Hi everybody,
I am having a serious problem with my computer. After turning it on, I see the window system runs as normal. But after that, it restarts automatically by itself instead of showing the screen to type user name and password. There is no error shown on the screen. This happens in both normal mode and safe mode.
I tried entering set up and select reboot from CD. I inserted a Window CD into the CD room. After copying files, it said that no hard disk has been installed in my computer.
Any idea?

What is your computer specifications? I know a way to solve this problem quite easily. Go into the Bios and there should be an option somewhere saying "legacy something" under the hard drive section.

Refer these threads :

http://forums.techarena.in/hardware-...ls/1134418.htm
http://forums.techarena.in/hardware-...ls/1064386.htm
http://forums.techarena.in/vista-har...ces/922070.htm

If your Harddisk is Sata Then might Be To Check this Thread http://forums.techarena.in/hardware-...ls/1027836.htm ,

Quote:

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Originally Posted by expertz

What is your computer specifications? I know a way to solve this problem quite easily. Go into the Bios and there should be an option somewhere saying "legacy something" under the hard drive section.

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My laptop model is Acer Travelmate 4720. I tried entering Bios but did not see "legacy something" as you said.
Would you tell me in more detail please?

Could it be some kind of viruses occur in my laptop? This issue happened just right after installing a new program. If this caused by viruses, how can I scan my laptop in this case?
Every suggestion will be appreciated.

I have just restarted my laptop in command prompt. It said "multi(0)disk(0)rdisk(0)partition(1)\Windows\system32\ntoskrnl.exe". Any suggestion?

the hard disk is likely to be SATA. Windows XP setup cannot assign drivers to the device, and so it can't be seen by it. Using a program called nLite, you can create a new disc with both Windows setup and the SATA drivers on it, so that Windows will be able to recognise the drivers. The SATA drivers should be on the Acer website.

Hey!
Try to repair install the windows... Not at the first interface screen but after pressing F8 key for accepting license agreement it will automatically detect the windows already installed. Press "R" key at that time and installation would start...! After Windows is setup, ensure you have a anti-virus software installed and fully updated...! If everything is well, fine! If not that this is a hardware issue, it could be any thing like : powersupply in your case may be battery or RAM or even cooling insufficient...! All the best...! Do post back...!

Firstly, thanks for all posts and suggestions.

Quote:

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Originally Posted by Rudra.J

Hey!
Try to repair install the windows... Not at the first interface screen but after pressing F8 key for accepting license agreement it will automatically detect the windows already installed. Press "R" key at that time and installation would start...! After Windows is setup, ensure you have a anti-virus software installed and fully updated...! If everything is well, fine! If not that this is a hardware issue, it could be any thing like : powersupply in your case may be battery or RAM or even cooling insufficient...! All the best...! Do post back...!

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Can you please show me in more detail? First, what I should do. And secondly,... step by step.
If it is possible, can you please spend a little time to guide me? Here are my email address and msn:
mik.mk1206@gmail.com
or on msn: michaeloros@live.com
Thanks in advance.