Startup Repair Boot Loop?

I get into startup repair everytime i boot my pc which is never successful. I am definitely goin to explain it in detail but dis is basic problem nd plz dont mind typing coz m typing fast on iphone which may cause errors in typing!Yesterday,i used my pc for 7-8 hrs continuosly which is not big deal but due to it i can't figure out my action which caused problem. I kept it on for downloading at night nd when in morning i got boot screen which comes when pc is directly turned off. I did Start Windows Normally nd i got usual windows 7 loading animation for a secong nd den it started startup repair after that everytime i boot it takes me to startup repair resulting in continuos failure. I hv googled nd found many threads but none matched my exact one. Startup infinity loop didn't work. Below r given few conclusions nd obstacles-1.) i can't get into advanced boot options using F8. But i can get into recovery menu using install dvd nd view advanced options frm startup repair.

2.) System restore din't work. I mean its not successful in restoring.3.) bootrec.exe didnt work4.) imp point to be noted is my last update was on 23 dec while pc worked fine on 24 th & 25th dec means dont knw wat happened 25th night that caused this problem on 26th morning.5.) sfc/scannow says "a startup repair is left to be completed." it says to complete that first then use sfc/scannow.6.) chkdsk results in last line saying failed to transfer log......7.) i also get a report like many others about that problem signature.8.) repair install not possible coz windows can't start only.9.)i hv made a backup using cmd but is there any way without clean install?