Remove Symantec BootGuard

[ButchAnton]

I have inherited a system (MBP running Mavericks) which has an odd problem. Somebody started installing Symantec Encryption Desktop on this machine and it appears they aborted it right after beginning. It seems like the disk never got encrypted. I reinstalled Symantec Encryption Desktop 10.3.2 so that I could get to pgpwde. Here's what I found:

% pgpwde --status

Disk 0 is instrumented by bootguard.
  Current key is valid.
Failed login attempt lockout enabled. Max failures=10
Request sent to Disk status was successful
 
% pgpwde --uninstrument --disk 0
Operation uninstrument disk failed:
Error code -12220: Disk already managed

That seems like 1) BootGuard is there, and 2) the disk is unencrypted. However, nothing I've tried gets rid of BootGuard.

Things on the disk look reasonably good:

# gpt -r -vv show /dev/rdisk0

gpt show: /dev/rdisk0: mediasize=1000204886016; sectorsize=512; blocks=1953525168
gpt show: /dev/rdisk0: PMBR at sector 0
gpt show: /dev/rdisk0: Pri GPT at sector 1
gpt show: /dev/rdisk0: Sec GPT at sector 1953525167
       start        size  index  contents
           0           1         PMBR
           1           1         Pri GPT header
           2          16         Pri GPT table
          18          22
          40      409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
      409640  1950314264      2  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  1950723904     1269544      3  GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
  1951993448     1531696      4  GPT part - 48465300-0000-11AA-AA11-00306543ECAC
  1953525144           7
  1953525151          16         Sec GPT table
  1953525167           1         Sec GPT header

However, fdisk doesn't really like it at all:

# fdisk /dev/disk0

Disk: /dev/disk0	geometry: 121601/255/63 [1953525168 sectors]
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------------------
 1: EE 1023 254  63 - 1023 254  63 [         1 - 1953525167] <Unknown ID>
 2: 00    0   0   0 -    0   0   0 [         0 -          0] unused
 3: 00    0   0   0 -    0   0   0 [         0 -          0] unused
 4: 00    0   0   0 -    0   0   0 [         0 -          0] unused

The good news is that the machine boots, just into BootGuard, and then after having the appropriate passphrase entered, continues to boot into OS X. However, I cannot upgrade it to Yosemite, since it won't boot into the installer after the initial reboot.

Any help would be incredibly awesome!

Thanks!