It worked!! A manual install of the latest NVidia driver did the job...!
Thanks guys, for your help....you saved my face
(my friend had bought a laptop with NVidia card only bcoz I told him that Linux supports it better).
And guess what...once I showed him Beryl and its tricks, all he did was wonder how Linux can do all that at 28% RAM usage where Wista (that came pre-installed) struggled at 60% and still not doing anything!!
Thanks again to all involved with Mint!!
"...Many people can only keep on fighting when they expect to win. I'm not like that, I always expect to lose. I fight anyway, and sometimes I win."