My computer locks up and won't boot. What do I do?

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My computer is brand new. It is a dell inspirion. I turned it on a few days ago and was surfing the web and it started saying I had a trojan virus infecting the files in my computer. I decided to just try to restore the thing cause I didn't know what to do and it froze so i turned it off. Now everytime I turn it on the black screen comes up saying it failed to boot, it wants me to insert the Windows Installation disk and repair it but when I put the disk in nothing happens.
Can you help me!?!

My computer starts does the memory check and after that, goes to a screen that gives me the options to go into safe mode, safe mode with networking, safe mode with command prompts, start with last known good configuration, and start windows normally. I cant find my windows start-up disc and was wondering if there was wondering if there was another way. I recently installed a new graphics card if that gives any more insight, thanks for any possible help.

When i restart my computer most of the time it will display the logo and the f functions like normal than screen will go blank. Than at the top left corner a - will flas for long time than will say operating system not found. I will than have to restar comper either by powering off or ctrl alt del over ans over unill it atarta normaly. I have done a complete reboot to manufacture state and it still does this. Any help?

I installed SP1 and my computer never worked again. I could not reinstall the OS because my disk drive did not work. So I ordered new restore disks and an external optical disk player. I finally got the disks in and set the bios to boot using USB and reinstalled. But alas it did not work and I tried numerous ways to reset the bios with no luck so now my computer, laptop, is at a technicians until next week when they can get to it. My beef is how can Microsoft do this to so many people. I am not the only one who was left with no means to get working because of Microsoft SP. It not only is loosing me money but it also is costing me to get what was a perfectly good, relatively new computer to turn on.... I am really pissed off and I want to know why anyone even needs the SP and why Microsoft just sends it out in important updates with very little information or warnings? I think that Microsoft should have to give some sort of retribution for causing something like this to happen. Then, last night I see the commercial for Windows 7.

I shut the computer off and tried to restart it but when I did it stopped at the windows screen and the loading bar just keeps cycling. It stays on the black screen and shuts down and does that all over again. I have tried replacing the hard drive with a new one but it does the same thing. What could be wrong??

i have a desk top with vista about a 2004 i am locked out when i power up it goes to a black screen saying user password and i have tried turning it off and pushing f12 and f2 and f8 and nothing the same thing and the same screen.

i basically have the same problem that a lot of other ppl have,which is dat my computer only wants to start up on a black screen n only safe mode appears 2 b the only way 2 get it 2 work.like some other ppl i have missed placed the start up cd's dat came wit my dell laptop.can some 1 help?

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