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As V wrote, bandwidth monitor is a good program for monitoring/logging your uploads/downloads from your computer.
Of course, this will only show you uploads and downloads from that specific computer, so if there are other computers using your network, you will need to take that into consideration as well. Your router will likely show how much data has gone through the router, which is a better indicator if more than one computer is using your network...
Your actual data that your ISP registers is likely to be a little higher than what your computer registers, as there will be occasional packets of data that hit your router but are not forwarded to your computer (port scans, etc). More if someone is trying to DDOS you :-)
Also, most ISP's in my experience do what hard drive manufacturers do, and count megabytes/gigabytes in the decimal way (eg 1000 mb = 1 gb) whereas your computer counts them in the binary way (1024 mb = 1 gb) so your ISP will for this reason likely register a little more usage than your computer accounts for.
Having said all this, there is something obviously not right. Web browsing might use megabytes, not gigabytes (unless of course your web browsing includes lots of youtube videos, online gaming, online radio etc - ie if you are using lots of rich media sites, these can chew up the bandwidth a bit).
What ISP are you with? Just interested to know who in Australia gives you a 100gb/100gb on/off peak plan.
Other things that might be using up data at a higher rate than you predict:
- if you have virus/trojans that are using your computer as a spam relay/to ddos other computers.
- if you have a P2P program going (which you said you turned off)
- if someone is using your wifi network
- software is downloading updates (eg windows update, Steam games etc).
Anyway, that's just a few things to think about.
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