Used to start up Windows 8 with Boot Camp, cannot anymore

Question

     A few weeks ago I installed Windows 8 on my MacBook Pro (running Yosemite 10.10.1) and, with enough finagling, was able to get both systems running smoothly on my laptop. It has been about a week since I last tried to run Windows, but I just spent a little while trying to start it up to no avail. The first few times, I started with a shut down computer, turned on the power button, held option to bring up my start up preference, and selected Windows 8. The screen would just go black and the hard disk seemed to be cycling between sleep and wake cycles. Eventually I manually shut it off, tried again. Repeated two or three times, same result.
     Tried start up without holding option - the disk tried to launch Windows, then took me into a sort of recovery mode with a screen saying there was a problem with Windows. I explored the options it gave me (i.e. change start-up settings, reset Windows, recover Windows...) but was really unsure of what my best option was from here. Does anyone have any suggestions for me?

Answer 1

I'll elaborate; the finagling really just involved downloading the Windows drivers provided in Boot Camp, which didn't let me have wifi in Windows, so I downloaded a different set of drivers, installed those, and all was well.
I do not have automatic OSX updates turned on.
Those commands give me:
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:          Apple_CoreStorage                         363.2 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
   4:       Microsoft Basic Data BOOTCAMP                136.0 GB   disk0s4
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Macintosh HD           *362.9 GB   disk1
                                 Logical Volume on disk0s2
                                 514D607E-31E2-41D8-99A1-B458A67630E6
                                 Unlocked Encrypted
Disk: /dev/disk0 geometry: 60801/255/63 [976773168 sectors]
Signature: 0xAA55
         Starting       Ending
#: id  cyl  hd sec -  cyl  hd sec [     start -       size]
1: EE 1023 254  63 - 1023 254  63 [         1 -     409639] <Unknown ID>
2: AC 1023 254  63 - 1023 254  63 [    409640 -  709468960] <Unknown ID>
3: AB 1023 254  63 - 1023 254  63 [ 709878600 -    1269536] Darwin Boot
*4: 07 1023 254  63 - 1023 254  63 [ 711149568 -  265623552] HPFS/QNX/AUX