Windows 7 unable to start, system repair and f8 functions unreachable

Before I start I'm sorry if this is in the wrong thread, i just joined and I don't want to waste time that could be spent trying to fix my computer.

Anyways, I've been recently trying to dual boot windows 7 and windows 8 release preview and i tried several methods from vhd to bootable usb, it was going pretty well until i decided bootable usb would be easier and got rid of the vhd that wouldve had windows 8. Now i am unable to boot my computer after a message saying bootmgr is missing. I have a system recovery disc but when i put it in it comes up with an error :status 0xc00000e9 info an unexpected I/O error has occurred. I also have the usb with the bootable windows 8 installation but that fails to start with another error; status 0xc000000f info a required device isnt connected or cant be accessed. i am currently making a windows 7 boot cd to see if i cant get that to help fix my problem. i would do the same thing with windows 8 but the windows usb/dvd download tool says my windows 8 iso is an invalid iso so i was unable to use that but i got it through a more difficult tutorial. I will answer any and all questions that further explain this problem to the best of my knowledge. I know little about scripts commands etc, but i have been trying to learn so if something like this were to happen it would be easier, sadly i didnt get enough time to work.

Any help is appreciated

EDIT: i have managed to get the windows 7 boot cd to load, i am currently trying to repair the system
EDIT 2: i have rebuilt the BCD and nolonger recieve the bootmgr is missing, that is the largest of my problems out of the way. Now i just have to figure out how to get it past the welcome screen without restarting will continue updates until i have gotten the system to boot normally then i will probably put a tutorial (or atleast the ones i followed) in case someone may have the same problem

If you don't have many programs on your computer, a clean install of Win 7 might be your best bet. Depending on which disk you have, try the related tutorial.
Clean Install Windows 7
Clean Install with a Upgrade Windows 7 Version
If you don't have a disk to do an install, let us know.

thanks bigmck, unfortunately a clean install wouldve been easiest but my computer has to many files on it right now that i cant lose. i have managed to start up in safe mode and will search for what to do from there.

EDIT: i can enter in safe mode but i am not sure what to do, i have run startup repair from the recovery disk and it says its fixed problems (dealing with the partition, which i am pretty sure is causing the problem) but it still reboots after the initial windows screen. I will get rid of the windows 8 partition to see if that help.
EDIT 2: i ran check disk and that helped. i can now return to my main pc