I tried installing the basic Sims 3 it in D drive and the folders are scattered around, so I put it in a new folder and changed the target. The game is able to load (thank goodness!), but then, I have problem. I had the expansion installed along in the Electronics Arts folder along with The Sims 3 folder but the game couldn't start up and it resorted into telling me 'Error in start up' and asked me to refer to the Log. For referrence, These are the sequences of the folders.
D:\Electronics Arts\The Sims 3\(All the other folders making up the game)
D:\Electronics Arts\The Sims world Adventures