Tried to put windows xp back on computer and now im getting error loading operating system not sure what to do please help

have you tried another windows DVD/CD some time xp crash easily the better is windows 7 i recommend you

now you are in trouble just repair you win hope you are computer will be fine without any error'

Please insert the Windows disk and restart to boot to the CD.

There is a special function called Recovery Mode in which Windows will just re-install the basic DLLs and drivers needed to make sure Windows functions.

Recovery mode WILL NOT remove your current Windows installation.

You can try to roll back by restoring your system. just type in command prompt : C:\WINDOWS\system32\Restore\rstrui.exe Please check for the back date . But upgrading does not create such problem how have you upgrade your system ? Is you window Genuine ?

Your operating system is corrupted and need to restore the missing file or reinstall the operating system.

Visit www.windowsreinstall.com and you will get illustrative images with text.

If you are attempting to use Recovery and this is happening, Most likely you have a corrupted recovery partition....

If you are attempting to load Windows XP from A CDrom (Externally)
you will need to use an XP Cd that has integrated Sata drivers.. Windows home/pro 32bit does not..

Or Use a Windows Media Center Edition Version

please try with F8 Function key

start your computer in safe mode
if it start then go to programs > accesories >systemtool >system restore
you get two choice
1.I want to store to earlier time
just select the date form left side square,mostly 2/3 days before date which ever is in bold
then restore to that snapshot ,start the computer

what is the error message that you're getting.. usually windows vista will not downgrade your operating system to windows xp. You may need to remove vista before you can load xp.
make sure to save a back up of all of your important files before you do that.

You are getting this error because you have formatted the harddrive and now your computer cannot find your old copy of Windows.
To install the new copy you have to put the Windows disk in the CD or DVD drawer and restart the computer, when the compter starts (before the no operating system window) you should have options to Enter SetUp. You need to press the appropriate "F" key to enter set up or boot order and tell the machine to boot from the CD.
As it is now your machine is trying to start from the harddrive and its not finding anything, you need it to start from the cd drive so that it can install windows.

Try running Windows in safe mode by turning the computer and holding down on the F8 button while the computer is booting.

Instead of the Windows XP screen you will get a menu displayed. Select the safe mode option and press enter.

If Windows doesn't complete startup in safe mode, you will have to reinstall Windows.

What anti virus program are you using?