Lately I decided to do a new full and clean installation of Windows XP Pro. I inserted my Windows XP Pro CD into the CD-ROM drive and rebooted my machine. After a few seconds as I expected I got the "Press any key to boot from CD…" message. I pressed the "Enter" key to enter the Windows XP Pro setup and ...SURPRISE ! After a few seconds I was sent back into my usual Windows XP desktop. I tried again ..reboot...got the "Press any key to boot from CD…" message again... pressed any key (I tried the "Backspace" key this time )...and again I was kicked back to my Windows XP desktop. I tried again twice but went through the same loop again. As far as I know my machine is configured to start from the CD/DVD drive if a Windows XP CD in inserted inside; if not then I would never reach the "Press any key to boot from CD…" screen at all. To be 100% sure I checked my Bios Setup --> Bios Feature Setup and saw that the 1st Boot Drive was indeed the CD ROM drive. I then tried to do the installation like if I install any other program. From my desktop I opened the Windows XP disc and then...--> Install Windows XP --> New installation (from the drop down menu options ) --> License agreement screen --> Production Key screen --> Windows setup disc is installing a few components' screen...and so on until my machine rebooted automatically. Every thing was looking fine until I got a message telling me that the new Windows XP Pro OS will be installed into my D drive (partition). My hard drive has three partitions : C ( where my OS is installed ) , D and E. Apart the fact that all my backup files are in partition D, I want my OS to be install into partition C as usual and not in D or E. I saw that I may choose the possibility to install XP into an other drive than D ( the one automatically chosen by XP install program) and picked drive C as I wanted. I got a message telling me that XP cannot be installed in that partition since an other XP OS is already installed there. I opened my CD-ROM drive , took out the XP CD install disc and rebooted to get back into Windows to look for help in a message board but to my surprise I could not get back to my desktop but only to the DOS like XP setup screen ( in spite that the install disc was out the CD- ROM drive!). The only thing I could do to get back to my desktop was to insert back the Windows XP Pro CD into the CD-ROM drive and chose to "Repair Windows XP Pro". I am now back to my desktop writing these lines. Any idea why I cannot do a full installation and clean Windows XP Pro installation in spite that my computer is configured to start from the CD/DVD drive and how to slove the problem? Thanks in advance.