Sigh, what a disaster manx!!
Yeah, just like what I mentioned above, after the first post, my internet connection broke down!!
I tried everything I could to solve the problem!!
I called to the ICP (internet connection provider) and asked them bout the issue.
However, they couldn't solve the problem even after sending a technical officer down.
It was proven that the line doesn't has any problems- the fault was thrown towards the router definitely....
After I double-checked the router with my laptop,it was shown that the router was working perfectly fine.
I connected the modem back to the pc and tried my very best to solve the problem.
Ultimately, I found out that it was the modem connected in the pc was disabled.
It was illogical though as it is impossible for a modem to has an ability to disable itself automatically.. Well,I suspect that it was due to the inproper wireless connection setup I did on friday!!

Sigh,I really suffers for those "connectionless" days - emotionally as well as physically... phew,luckily I have solved the problem. The wireless connection is down though. On top of that the internet connection isn't that stable as well...