Thanks Mr. Rajan, I registered two accounts.
For all who got registered with box.net for 50 GB, here are two nice ways (which I could find) by which you can integrate this storage with your Windows Explorer. Otherwise, box.net don't give you any app, which can connect your computer with online storage (unlike dropbox or sugarsync) as of now.
1) use a third party software - http://www.gladinet.com/index.htm
this will create a Z drive on your computer, where alongwith box.net you can register 1 more cloud storage (like google storage etc) for free version.
2) by creating a network folder in Windows - process given here..http://www.makeuseof...ndows-explorer/
this creates a network location for your box.net
I have tried using both of this & found 1st to be more user friendly & simple. However, free gladinet has some limitations which may affect some user (like no 2 way sync), but for reliable digital photographs storage, we can use this as it is, since sync is not required in most of the cases..