Help Huge problems with pc

My pc suddenly stop working. it was giving bootmgr error and i didnt had any dvd repair tools.

So i installed an old hard disk which had windows and then tried to use easy bcd to repair my other bootable disk.

But some how now i get 0xc000000f boot file missing if i bootup with main hard disk. However if i bootup with my oldbackup hard disk, somehow its loading my recent OS instead of the old os which it did when i used it 1st time.

Also my dvdrom has suddenly stopped working

when i ran microsoft fix on dvd it came up with ordinal323 could not be located in dynamic lib error

I tried to use sfc/scannow but it says it cannot repair and its gona repair after next reboot but it doesnt repair and it says same thing everytime i run it.

Any help??

Sounds like to me its time for a fresh install on the HDD. This way it will get rid of those errors etc. My rule of thumb is when something requires Windows Tools to fix it, my best bet is to just reinstall the OS.

I cant reinstall i need data so i cant format it.

Boot off a Linux Live CD and extract what you need out of the hard drives.

Looks like your MBR is messed up , try booting from the current HDD only (disconnect the old one) and tell us what happens .