How to load balancing data between various internet gateway ?

In my company , there are 3 lines ADSL with different ISPs , 2 are for backup purpose . I can access the internet by setting either one of 3 gateway in LAN ipconfig . However , I am just going to download a lot of data , so I would like to someway make use all of 3 those line ADSL . Are there any ways to do that ?
I prefer not to install complex and heavy software on my PC , because its in the office , I am going to use Internet download Manager to download data faster . It would be nice if I still be able to use IDM along with .

Thanks
I am waiting for your solutions !
haidangAsked:
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vpt-incCommented:
The best way to do this would be with (what i'm imagining would be) a network infrastructure upgrade to a router that would handle all the connections... In reality this is going to be a pretty involved project and I'm pretty sure windows can't do it on its own just for your station (although maybe with multiple nics?).  The real solution to this problem would involve running a routing protocol in conjunction with your isp which is something they just won't do for you with that class connection.
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Jay_Jay70Commented:
yep, you need a stronger firewall that allows sharing and failover
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haidangAuthor Commented:
That means its impossible ?
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vpt-incCommented:
Yeah it's pretty impossible without having at least a t1 or other connection where you can get your isp to work with you.
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Jay_Jay70Commented:
indeed :(
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haidangAuthor Commented:
Lets make it simple !
There are 3 gateways that could access the Internet
  192.168.5.50
  192.168.5.100
  192.168.5.200
How could I make use all of those ?
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haidangAuthor Commented:
Despaired ! , thinking I should close this question , just waiting for a few days more .
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