Multiple Ethernet with Multiple Gateways/IP

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Hi to all... I want to tell you the story of my networking problem below... I have one Ethernet card, and OS is XP, and my ip config is: IP: 10.14.58.142 Subnet: 255.255.255.0 Gateway: 10.14.58.1 its only static ip assign to me for accessing the net...and as i surf or download from internet, my account is updated i.e. charge for accessing the net... And if i change my ip address to something else, let suppose to IP: 10.14.58.14 Subnet: 255.255.255.0 Gateway: 10.14.58.1 then also i am able to access the net...but this time the user whom this IP is assigned to has to pay for the net... that means i have different ip with one single gateway by which i can access the net... So my first question is that is there any way to combine these two ip's to get double or triple the speed,,, And secondly if i opted for the different gateway, then also i can able to access the net... i.e. if i assign my ip config to IP: 10.14.57.88 Subnet: 255.255.255.0 Gateway: 10.14.57.1 --- (Different gateway) then also i am able to access the net... So is there any software which is capable of join these two or three gateways or IP's to get double or triple the speed.... Well i have already opted for VMWare and Virtual PC, and run another OS in this and assign a proxy in that, but it leads to more memory consumption... And one more thing in Virtual pc and vmware, i got 4 virtual network cards with different gateways and different ip's so is there any way to combine these 4 virtual network cards to make them as a single ehternet card and increase our internet speed by four times...