I think you just erased your hardrive. (Or it wouldn't show the Operating system not found message).
That means your data is already lost. (Unless you have 2 harddrives in your pc)
Get a Windows Installer CD from a trusted source. ( Maybe the local computer store can lend you one)
Test this cd on another pc (By just booting the cd , not by running the installer!)
Install Windows using this cd (Start it using F12 like you said)
Testimonial: "Thanks for your help"
Isn't it just loading? Be patient.
after a couple of hours appear same message: "1962: No operating system found. Press F1 to repeat boot sequence". Do you think that the HD is corrupted or damaged ?, startup sequence is; CD-ROM Drive, HD, Removable device, this will affect ?, thanks.
It might be your CD-drive. Could you try a USB CD-rom drive?
I have unplugged the HD and CD-ROM DRIVE and plug it again and works now, windows start normally and in secure mode as well, but my suspect is that it is infected with some virus, cd-rom doesn't work, it can't read any cd, I have a USB U3 Memory, what I want is format HD and install windows again, How can boot using my usb and format hd ?, thanks.
Try using these instructions:http://liliputing.com/2008/04/install-wi...
Could you also be so kind to adjust your rating of the solution after these last comments?
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I am using Windows XP Home Edition Original CD, I tested in another computer and cd can be read and show installation screen, tried in bad computer with F12 to reboot with cd but screen is black and cursor is blinking, cd-rom is blinking also,
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