'system Volume On Disk Is Corrupt' And Sfc Scan Not Working

I have a toshiba with a windows 7 64bit, and it's been acting really slow recently and freezing up on me so I thought there might be viruses that I needed to get rid of, so I restarted my computer so I could go in safe mode with networking to check if there really were. When I restarted my computer I momentarily forgot to press the f8 key and the windows starting screen with the logo showed up. Without thinking I turned off my computer since I didn't want to restart again (it took forever for the computer to do). Once I turned the laptop on again I ended up going to system repair. For some reason this did nothing to my computer. I left it on for hours and hours until I finally decided I wasn't going to get any results. I once again restarted the laptop but this time when I went to system repair I cancelled it and when into more options and tried doing a system restore which also didn't work and said a bunch of my files couldn't be read. When I looked back at the system repair log it said "system volume on disk is corrupt." I googled it trying to find something to help me, and every place said to run sfc scan, which I did on command prompt, which always gave me the reply "there's a system repair pending which requires reboot to complete" and since my computer can't reboot properly no matter what this is what it'll say. Is there some way to run this scan or another way to fix my computer without having to lose all my data? I have some really important files on here. I've also tried running chkdsk /r /f in command prompt which it wouldn't let me do and said it can't lock the current drive because the type of file sytem is NTFS.