Note that the scan result reports "possible" , only because those ports are open, not because you have a trojan. One failing of reports like that is, that it does not also report the possible legitimate services that use open ports.
That said, the port 80 is used for HTTP and 8080 is a common proxy port. First, confirm that those ports are actually open on your PC, on not the result of filtering by your ISP. Some ISPs filter all traffic to their customers for some or all ports, and a scan will show their open ports and not yours (even if the scan site shows your IP). Open a MS-DOS command prompt and type netstat -an, that will show the true status of your ports.
This page will help:
http://www.geocities.com/merijn_bellekom/new/netstatan.html
Or you could use a program like TCPView:
http://www.sysinternals.com/ntw2k/source/tcpview.shtml
If this method does not show those ports open, then don't worry. If they are open, then you have programs like a web server and/or local proxy holding them open, and yes, you could also have a Trojan(s).
These can help identify what processes are running on those ports:
TDIMon
http://www.sysinternals.com/ntw2k/freeware/tdimon.shtml
or
Port Explorer
http://www.diamondcs.com.au/portexplorer/
Also, you don't mention having a firewall, if you do, it should not have allowed those ports to be visible (assuming those ports are really yours). Check your configuration. If you don't have one, get one. I use Outpost Pro, but there are many to chose from, and can be found here:
http://www.staff.uiuc.edu/~ehowes/soft7.htm
You could look into anti-Trojan programs, but beware of the free ones listed here, they haven't been updated in a long time:
http://www.staff.uiuc.edu/~ehowes/soft5.htm
Some other info you may be interested in:
Firewall FAQ
http://www.robertgraham.com/pubs/firewall-seen.html
Port lists
http://www.staff.uiuc.edu/~ehowes/info18.htm
Other Security and Privacy tests
http://www.staff.uiuc.edu/~ehowes/info17.htm
PS. sorry I didn't see your post earier 
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