why my wifi is not woking whereas my wired connection working well

I used to browse very well with my wifi connection until few days back, whenever I wish I used the connection in both wired and wireless mode, and there was no problem at all. Recently my wifi connection started malfunctioning giving error'Internet Explorer cannot display the webpage', thus wireless mode stopped working.whereas if I am connecting wired mode, internet explorer is working fine without any problem.I am also using a Samsung Tab , in which the same wifi connection working very well (infact I am posting this question through my Tab connected wirelessly with the same modem).I am having Internet Explorer 8 on my laptop windows xp Professional SP 3 version, usingBSNL ADSL2+CPE/WIRELESS ROUTER TDSL 300w2 modem.I tried all support solutions through your forum, but my problem could not be resolved.Pleas help me...thanks..

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