BSNL 3g usb modem slowed down after installing bit defender antivirus on pc

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ISP
bsnl 3g
:frown:
its been a month since i got this device (BSNL 3g Huawei e156 usb modem) with me....but recently when i tried to change my antivius software from Mcaffe to Bit defender things went haywire...the speed was tremendously brought down...i tried tcp optimiser and other softwares to increase the speed but all were in vain..i got a Dell studio XPS and i use windows vista and firefox as my web browser..when i went to check the speed in Speedtest.net - The Global Broadband Speed Test i was shocked in seeing that the speed was 93mbps..
is there any way to tweak my system to its original condition..
is there any way to get mobile partner software
are there any antennae available in bangalore for this device???
please help..
 
wat is the 3G usb,it is unlimited and at what prices and what download and upload speeds
 
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