hi all, i am using backtrack5 R2 GNOME (32bit).I tried to install virtualbox-4.1 through terminal as explained in https://www.virtualbox.org/ and synaptic manager by installing packages but finally left with the error :Error! Bad return status for module build on kernel: 3.2.6 (i686)

Here i am pasting the "/var/log/vbox-install.log"

Code:
** Compiling vboxdrv
Attempting to install using DKMS

Creating symlink /var/lib/dkms/vboxdrv/3.1.8/source ->
                 /usr/src/vboxdrv-3.1.8

DKMS: add Completed.

Kernel preparation unnecessary for this kernel.  Skipping...

Building module:
cleaning build area....
make KERNELRELEASE=3.2.6 -C /lib/modules/3.2.6/build M=/var/lib/dkms/vboxdrv/3.1.8/build.....(bad exit status: 2)

Error! Bad return status for module build on kernel: 3.2.6 (i686)
Consult the make.log in the build directory
/var/lib/dkms/vboxdrv/3.1.8/build/ for more information.
0
0
Fatal Python error: non-string found in code slot
/usr/sbin/dkms: line 3505:  4848 Aborted                 python /usr/share/apport/package-hooks/dkms.py -m $module -v $module_version
Failed to install using DKMS, attempting to install without
make KBUILD_VERBOSE= -C /lib/modules/3.2.6/build SUBDIRS=/tmp/vbox.0 SRCROOT=/tmp/vbox.0 modules

  WARNING: Symbol version dump /usr/src/linux-source-3.2.6/Module.symvers
           is missing; modules will have no dependencies and modversions.

  CC [M]  /tmp/vbox.0/linux/SUPDrv-linux.o
/tmp/vbox.0/linux/SUPDrv-linux.c: In function ‘VBoxDrvLinuxInit’:
/tmp/vbox.0/linux/SUPDrv-linux.c:443: error: ‘nmi_watchdog’ undeclared (first use in this function)
/tmp/vbox.0/linux/SUPDrv-linux.c:443: error: (Each undeclared identifier is reported only once
/tmp/vbox.0/linux/SUPDrv-linux.c:443: error: for each function it appears in.)
/tmp/vbox.0/linux/SUPDrv-linux.c:443: error: ‘NMI_IO_APIC’ undeclared (first use in this function)
/tmp/vbox.0/linux/SUPDrv-linux.c:457: error: ‘nmi_active’ undeclared (first use in this function)
make[2]: *** [/tmp/vbox.0/linux/SUPDrv-linux.o] Error 1
make[1]: *** [_module_/tmp/vbox.0] Error 2
make: *** [vboxdrv] Error 2
after this error,when i tried to install s3g unichrome graphics driver,but it had given me the same error.After reboot i lost xorg sever for which i have already posted a thread
http://www.backtrack-linux.org/forum...ad.php?t=50473
any one please help me out...........^^