I installed Windows 7 32 bit and Windows 7 64 bit today into Boot Camp and they both work in Parallels Desktop.
I installed them on my /dev/disk3 disk:
	Code:
	
JoeMacPro:~ joevt$ diskutil list /dev/disk3
/dev/disk3
   #:                       TYPE NAME                 SIZE
   0:      GUID_partition_scheme                     *1.0 TB
   1:                        EFI                      209.7 MB
   2:       Microsoft Basic Data                      21.3 GB
   3:       Microsoft Basic Data Windows 7 32         75.2 GB
   4:       Microsoft Basic Data Windows 7 64         76.0 GB
   5:                  Apple_HFS Classic              42.9 GB
   6:                  Apple_HFS Misc4                107.4 GB
   7:                  Apple_HFS Multimedia           322.1 GB
   8:                 Linux Swap                      32.2 GB
   9:                  Apple_HFS Big                  322.1 GB
JoeMacPro:~ joevt$ sudo gpt -r show /dev/disk3
...
JoeMacPro:~ joevt$ sudo gpt -r show -l /dev/disk3
gpt show: /dev/disk3: Suspicious MBR at sector 0
       start        size  index  contents
           0           1         MBR
           1           1         Pri GPT header
           2          32         Pri GPT table
          34           6         
          40      409600      1  GPT part - "EFI"
      409640   209715200      6  GPT part - "Misc4"
   210124840      262144         
   210386984    62914560      8  GPT part - "Ubuntu Swap"
   273301544    41680896      2  GPT part - "Ubuntu"
   314982440      262144         
   315244584   629145600      7  GPT part - "Multimedia"
   944390184      262144         
   944652328   629145600      9  GPT part - "Big"
  1573797928      262144         
  1574060072    83886080      5  GPT part - "Classic"
  1657946152      262144         
  1658208296   146800633      3  GPT part - "Windows 7 32"
  1805008929           7         
  1805008936   148516193      4  GPT part - "Windows 7 64"
  1953525129           6         
  1953525135          32         Sec GPT table
  1953525167           1         Sec GPT header
JoeMacPro:~ joevt$ sudo fdisk /dev/rdisk3
Disk: /dev/rdisk3	geometry: 121601/255/63
Signature: 0xAA55
         Starting       Ending
 #: id  cyl  hd sec -  cyl  hd sec [     start -       size]
------------------------------------------------------------
 1: EE    0   0   2 - 1023  59  47 [         1 -  273301543] 
*2: 07 1023  59  48 - 1023 191  17 [ 273301544 -   41680896]
 3: 07 1023 176  39 - 1023 155  24 [1658208296 -  146800633]
 4: 07 1023 155  32 - 1023  80  24 [1805008936 -  148516193]
 Before you add a Boot Camp Windows installation to a Parallels Desktop virtual machine, do the following:
1) Make sure it has a boot folder and bootmgr. If it doesn't, then run EasyBCD to create a BCD and then you need to setup a default boot entry for Windows 7. Note Windows XP uses NTLDR and boot.ini, not bootmgr and boot folder which are used by Windows Vista and Windows 7. 
2) Make sure the partition is flagged as active because Parallels does not have an option to do that for you. This is only necessary if you use something like rEFIt which modifies the active partition flag everytime you boot and you have more than one legacy OS on the same disk. In the fdisk output above, partition 2 is active but Windows 7 32 bit is on partition 3 so I did the following:
	Code:
	
JoeMacPro:~ joevt$ sudo fdisk -e /dev/rdisk3
fdisk: could not open MBR file /usr/standalone/i386/boot0
Enter 'help' for information
fdisk: 1> f 3
Partition 3 marked active.
fdisk:*1> quit
Writing current MBR to disk.
Device could not be accessed exclusively.
A reboot will be needed for changes to take effect. OK? [n] y
 You don't need to reboot after using fdisk. Then I created the Windows 7 32 virtual machine by selecting partition 3 on disk 3. When Parallels Desktop finished setting it up and installing Parallels Tools, I shut it down and started to add a Windows 7 64 virtual machine. First I had to set the active partition to partition 4:
	Code:
	
JoeMacPro:~ joevt$ sudo fdisk -e /dev/rdisk3
Password:
fdisk: could not open MBR file /usr/standalone/i386/boot0
Enter 'help' for information
fdisk: 1> f 4
Partition 4 marked active.
fdisk:*1> quit
Writing current MBR to disk.
Device could not be accessed exclusively.
A reboot will be needed for changes to take effect. OK? [n] y
JoeMacPro:~ joevt$ sudo fdisk -e /dev/rdisk3
 Then I created a Windows 7 64 virtual machine in Parallels Desktop by selecting partition 4 on disk3.