I would mine Litecoins, except that every miner out there was written with trojan code (not the malicious kind, just to connect to everyone apparently) and the only way to get past it is to uninstall my virus protection..
What antivirus are you using? Microsoft Security Essentials doesn't have any problem with LTC miners...
McAfee has a problem with all of them sadly. Apparently they were written with the kind of code used with trojans so it gets a generic trojan flag. There are options to appeal it with mcafee but i dont think anything ever comes of it.