Hi.  Internet video for some sites are not streaming on my Nexus 7. 
What could be the reason for this ?

1.  Flash not installed ?
2.  Problem with service carrier ?  Despite showing strong 5 bar signals, bid does'nt stream.
3. YouTube videos are working perfectly well.
4.  Do I need to root my device for overall improvement in speed ?

Thanks. Mave

I came across a very useful  YouTube Video on "50 Tips you should know about Nexus 7" or something like that. 

An English commentator gave a very elaborate explanation on how to get most out of the tablet.

Hi - i'm a new, proud owner of Nexus 7 & absolutely lovin' it.  I read somewhere that it's worth rooting the device.
Once it's rooted, does it mean i loose everything that is already on it ? 
How can i restore it with applns/ bring it to working level.

Secondly, how can i download Andriod games from my PC & transfer to tablet ?   Reason, i have faster internet on my PC.