HT1338 new MacBook air. Recovery disk not made

I have a Macbook air (Dec 2011) which came preloaded with Lion OS.
About a month ago (August or early this month) I upgraded to Mountain Lion.
On disk utilites, it is reported that the verification can not continue as the file system is corrupted and I am asked to use the recovery disk and restart.
Now have not made any recovery disk. In fact while writing this I am taking a back up on an excternal drive.
I do not know if the corrupted files will be backed up as well. I suppose, even if it does, after I have recovered the OS or rpaired it, the back will also get the replaced / repaired image.
I am going to try and recover it online, and I am woried that my MS office for Mac and other software may need a new installation. I mean its not only the time but also the chargeable GBs that I have to pay for. (I have a monthly 15 GB 3-G plan) This is in fact one reason I do not use the iCloud.
I will report back if I was able to recover / repair the system.
By the way, apparantly my  Macbook air  shows no symptom of sickness. I guess the OS is good may be some file system is corrupted and that is why the disk utility stopped the verification.
J.

Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ If you’re running OS X 10.7 or later, open LaunchPad. Click Utilities, then Terminal in the page that opens.
Drag or copy — do not type — the following line into the Terminal window, then press return:
df -Hl
Post any lines of output that appear below what you entered — the text, please, not a screenshot.

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