Network driver update did not help,
Audio drive update did not help, (was suggested by Symantec Tech)
Reinstalling 11.0.6 did not help, still comes up with blue screen.
Manual uninstall did remove 11.0.6 but files and registry entries of 12.1 still remains and would not allow you to install or uninstall.
I have 2 GB or ram, some of them had 8 GB of RAM
Finally on Thu, I did a system restore, It will come up with "Antivirus and Antispyware Protection" off. But just wait for few mins and it turns "ON".
Then do a complete uninstall or 11.0.6, uninstall liveupdate, restart, and rollout the 11.0.6 client back and you are back to normal but with 11.0.6 client.
Will wait for patch to be released before I roll our on Windows vista 32 bit.
NOTE: Roll out on test PC first before you rollout on production.