Startup repair problems

Hello !
I was on my laptop 5 days ago when it crashed and brought me to Startup Repair. It had happened twice in the past and the problem had solved itself with the program. But this time, i tried 63 times and nothing happened. I tried everything (I think). I pressed F8 to start my computer another way but it brings me back at the same place. Settings don't change anything, Safe Mode doesn't launch and trying to run the computer with another Driver doesn't work. I also tried to restore my computer to a couple of days without success. Another thing I tried was to start the computer normaly but it always comes back to where I started (Startup Repair). I was so tired of working on it I went on my other computer (which is old and slow) to find answers on the internet. I tried running my operating system disk(Windows 7) and tried to launch the installer but it doesn't launch. School started two days ago and I already need my computer. Help would be greatly appreciated. MrDub

P.S: I didn't download anything in the past 2-3 weeks and I scan everything I download. I'm running a Dell Inspiron 17, 250G Memory, 4G RAM, Intel Graphic card with Windows 7 64bit. Restoring data is not an option because I have important files on my computer. Loosing them would be a catastrophe. Thank you ! :)

Thank you again theog for helping me out ! :) BFK sent me a page to download a W7-64 bit repair CD, but unfortunately, it wasn't successful. But, by starting my startup repair 4-5 times, I was able to get to system recovery options, somewhere I hadn't been before. Thank you for this, it was the first time I was seeing progress on my computer . But after several attempts at sfc/scannow in cmd, nothing happened except it saying that it found ''corrupted files'' in cbs.log. I try to access it but it says the access is denied. Tried alot of other things that wern't successful and now, the only option that comes thru my mind is to send my computer to a technician . Thank you again for your time. If you have any other tips, tricks or anything else that could help me, I would be eternally thankful. Have a good day. :) MrDub