How to fix this computer problem?

I have a DELL desktop This is what happened:

I was playing fine on my computer. It was working and everything. I leave the house to do some errands. I leave the computer open and the monitor off because I thought that I would be back very soon. However, there were some things that happened which resulted me coming home later than I expected(around 3-4 hours).

When I arrived home, I expected my computer to be still on so all I had to do was turn on the monitor. When I turned it on, I discovered that the computer had shut itself down. I started the computer up again, however, it didn't start up normally. As it was starting up, there were some internal computer engine noises. I got scared and thought it was going to explode.So, I force shut it down by holding the power button. This time, it started up perfectly, however as it got to the Windows XP loading screen, it suddenly turned to a screen that said something about a floppy diskette seek failure. I didn't know what to do. So I searched for how to fix it on my iphone. I found the solution. It told me to go to boot menu and remove the USB Floppy Drive from the Boot Sequence and turn the diskette drive off from the "Drives" category. In the solution video that I watched, it worked perfectly, but on my desktop, it totally failed. The floppy diskette seek failure disappeared, but another problem occurred.

It was starting up perfectly until it came to the screen where it said, "We apologize for the inconvience, but Windows did not start successfully… Blah blah." I chose "Start Windows Normally" option. It did nothing and came back to the same exact screen. This happened two days ago, I thought it would be fixed if I left it alone for a few days. I was very wrong. The same problem is happening. I turned on the computer today, hoping it would be fixed, it is still looping as I'm typing this.

So, Please Help ME! Thanks IN ADVANCE. WHOEVER FIXES THIS IS A REAL LIFESAVER!

It sounds as if the windows installation has become faulty.8.

Try and boot into safe mode.

To get into safe mode you need to re-boot the pc and before the windows logo appears press F8.

You may need to press it more than once.

Once the safe mode menu appears make your selection, try the last known good configuration first to see if that works.

If you can load into safe mode correctly then it is something loading at startup that is causing the problem, in that case raise another question giving that detail.

If you can get itno safe mode then go to the start/ run/ search box and type in:-

sfc /scannow that will attempt to fix any problems it finds.

Also see here:-

http://pcsupport.about.com/od/toolsofthetrade/ht/sfc-scannow.htm

Now with that the error is from the operating system of your computer, best way to fix that in less than an hour is to get a window xp (pack of your choice but most be the same with the previous window or higher) insert the disk and update your booting squence to booth from cdrom it will pop a screen instructing you to press any key to continue and after copying window file it will ask you to press f to format or r to repair previous window press r. After this stage your computer will be as good as new with no loss of personal data.