Avira Premium Security Suite BSOD on startup

Hi guys
Yesterday i got a free Avira Security Suite Key(Legal) from a giveaway
the key is valid for 92 days till 20th December 2010

so i uninstalled my Avira Antivir Personal and installed the Avira Premium Security Suite
i updated the program and ran full system check
disabled the firewall(i have Comodo free firewall) :geek:

but when i restarted the computer it gave me BSOD
i restarted again twice and it BSODed again and again

so i finally activated windows repair module and reverted to the last System Restore point
on startup, i found Avira Security suite gone and a dialog box with this message:-

Windows has recovered from an unexpected shutdown said:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 16393

Additional information about the problem:
BCCode: 6b
BCP1: 0000000000000000
BCP2: 0000000000000000
BCP3: 0000000000000000
BCP4: 0000000000000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\092110-17238-01.dmp
C:\Users\Sourav\AppData\Local\Temp\WER-27892-0.sysdata.xml

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C:\Windows\system32\en-US\erofflps.txt

Click to expand...

please help!!
now i have reverted back to Avira antivir Free again
and now no BSODs

i can upload my HBDEV key details if you want
it was gotten from Avira site itself