Internet Doesn't work in new DELL Inspiron laptop

Hi....All

I recently bought Dell Inspiron 14R N4110, which came only one default partition (C:\) with Windows 7 Home Premium.
But later on, I did one more partition (D:\), and I installed all drivers(which comes with Dell laptop). but some how my internet is not working properly. Sometime its too slow and not connecting.

I reformatted the laptop, and Restored the modem/router to factory defaults (in that order) neither helped. But if I restored my laptop to factory default (which I don't want, because it has only one partition C:\ ), than everything works fine. Why its happen ?

I hope that you people will be a big help.
I greatly appreciate your help.

Thank you.

nevernine,
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From your post, I'm confused.

The problem does or does not exist?

If problem exists, then:
WIN + X keycombo | in the Wireless Network section, if you see Turn wireless on, then click on Turn Wireless on. | ALT + F4 to close the window

WIN=key with microsoft logo on top.