I had the same problem, got an email from secuROM which contained a link for a fix. Havn't got the original email but I did post the fix on the Farcry2 forum. click here scroll down to the third post from 'nemisis87571953' to find it hope it helps.
AAAAHHHHHH. It cant be legal to sell software that makes you disable all your otherlegal software and still, STILL it doent work. Have followed citadel and ghenhiscant's suggestions and still does not work, on my 15th email to the securicom people... I dont have the confidence or the inclination to install vista as a dual partitiion to play a single game.... thanks for your suggestions... anymore though as I am still getting nowhere