Need help with pc boot up problem!?

My friend gave me his asus pc with no hard drives. It seems to me that the hard drive is the place where the computer should boot up from to start windows. His system runs on Windows XP professional and I inserted my hard drive which was from my old pc (Windows Xp home edition). Now the problem is when I turn it on it it boots from the hard drive and then it send me to this page where it says,"Windows did not start correctly.Please chose the following options to start. Then I press,'' Start windows normaly'' and It sends me back to the boot up start and then to the same page that I was on which said Windows did not start up correctly. What do You think I should do?The Asus pc is in fine working condition. I inserted the hard drive which I used from my old pc. Oh and does the asus computer still work with Windows Xp home edition if it runs with Professional?

I have no clue!! I just want the points!!!

You cannot take a hard drive from another system with Windows on it and put it another system without re-installing Windows. Windows takes a "snapshot" of your system hardware when you install it. It recognizes that you don't have the same hardware when you put it in another system, so it will not start correctly (not to mention the drivers will not be the same as the old system).The OS version will not matter as long as the manufacturer has drivers for it. Regardless you will need to re-install.

Bungle beat me to it. Basically, you'll have to reformat your hard drive and reinstall Windows on it. You'll want to set the boot sequence in the BIOS to do the CD/DVD before the HDD. If you're concerned about losing your information on your drive, get a new one and install Windows on that, and just setup your old drive as a slave.