Hi gtaillandier,
Trojan-Gen is often a sign of adware/spyware crap: run some specialist scanners:
AVG Anti-Spyware (Requires Win2k/XP):
http://www.ewido.net/en/
a-Squared Free:
http://www.emsisoft.com/en/software/free/
Ad-Aware:
http://www.download.com/3000-2144-10045910.html
Spybot Search & Destroy:
http://www.safer-networking.org/en/download/index.html