Hello,
Well I Formated my HD and installed Windows Vista Ultimate... But the installation prosses Was Very Slow...and when it finished, the system was So slow, that you cant do anything.. and i tried that with new Hard Drive that i just bought but the same thing happens.. Also i tried to install windows Xp and the Same thing there... But when i boot in Safe mode it Goes A little Bit faster , So What maybe the Reason that Happens that ???

Before the Format all was great except that i have this blue screen errors...

well, usually the notification you get points to an irq problem. There's many ways to try to solve it, but the easiest would be to check all your PC cards first (graphics card, soundcard if you have it, etc).
However, as you seem to have a laptop, everything I just wrote (and have now deleted again) isn't really of any use to you. You have an IRQ conflict, or incorrect drivers installed.

Before reinstalling windows again, which really might be the easiest thing to to, apart from sending the laptop back to Dell, or simply calling them about this problem, is downloading all the correct drivers from Dell and installing them.
If installing them doesn't do the trick, you might try doing it again after reinstalling windows, and before runing windows update.

If that doesn't work, then you're going to have a long search ahead of you trying to find where the irq conflict is. Usually this kind of problem occurs when two internal devices try to use the same IRQ address at the same time. This can be a driver issue, but can sometimes also be a failing hardware issue. Usually it is a driver issue though, and I have personally noticed it is often a problem of a network card. Obviously, you don't have a network card, as it is integrated on your motherboard. So we might have to look for different options. You may be able to look in your BIOS to see if two devices are set up to use the same IRQ there. If so, then you might need to do something about that.

oh ok, if it's your regular PC, it might be something which is easier to fix. Though it is still probably a driver problem. So please, go to the manufacturer website of every part in your computer (motherboard, graphics card, sound card, network card, raid controller, etc) and get their drivers. install them.

First though, open up your computer.
With installing this new hard drive, you may have knocked loose a few connections in your computer. Yes, it might really be that simple.
Start with your hard drive. If it is sata, take out the power cable and the red data cable, and put them back in, and make sure you press them in firmly. Do the same with the red data cable on your motherboard (and any other red data cables on your motherboard.)
Then, take out any expansion cards on your motherboard such as graphics cards, soundcards, etc, and put them back in. For anything but the graphics card, it would be good to see if it's possible to see if they can go in a different slot.
if you see any other cables connected anywhere, press them down to make sure they are well connected.

Also, you put in a new HD. Was windows on the old HD? and did you leave the old HD in there? if so, try to disable the HD and try the computer then (disable the old HD I mean). Now.... don't do all of this at once, first try what I said above, if that doesn't help, try the hard drive thing.

If neither of these things work (drivers, hardware, hard drive) then you are going to have to look for the IRQ conflict.... and that is a tough thing to do.

Listen.... stop stressing, and stop panicking.

Installing the drivers may solve the problem. Sometimes the IRQs are assigned, and installing the correct drivers can solve any conflicts you may have. Thinking that no drivers are installed after a clean install of windows is not correct. There are always drivers installed, it's just that windows installs the drivers it thinks you should have (or generic drivers) if you don't tell it to do something else. By giving it another driver, you are overriding the driver windows has installed by itself.

The fact that your windows install was very slow, I would say that either your hardware is a bit wonky (which could simply mean you have a loose connection somewhere) or that windows took a very long time to search for the correct hardware and drivers and in the end couldn't find it.

So, do what I said, check both the hardware (connections), and download drivers for everything and install them. Then check to see if you still have the problem.

The error codes on your screen say that it may be any number of things by the way.... from faulty ram, to a damaged CPU to a bad driver, problems with your bios or even trying to install windows on a computer with more than 3 GB.
So, if your computer has more than 3GB of ram....try reducing the RAM! see if that helps...

Well, you might as well re-enable the ehternet card as well though. And see if that causes problems. I think that if you download the correct drivers for your chipset/motherboard, that you should have your problem fixed anyways, even if it is the onboard lan....

But great to hear that your problem is now solved!