i post my problem here as it seems the only place where i've found people who actually know what they're talking about. I have a Sony Vaio Laptop running windows 7 64 bit infected with the sirefef virus. Microsoft security essentials shows that it found:
Every time i boot the computer, MSE finds these infections, and prompts me after a minute to restart in order to complete the removal. But every time it reboots, the message is still there. I tried installing Malwarebytes but it won't let me cause it says "access denied" or something like that. Sorry for not providing any more information but i can use my pc for a couple of minutes every time (cause it reboots automatically). I followed your instructions and scanned with DDS. I attach the attach.txt file it generated. I look forward to hearing from you as i really need the laptop for my university studies and i'm in the middle of the exams period. Thank you for your time!
P.S. If i restore my whole system to factory settings, is the problem going to persist? Cause if it's not, i will do it in a heartbeat. Only problem is that i am afraid of infecting my external hard drive (which would be already infected if the virus spreads to external devices). Would that be the case? Will i need to clean my external HDD too?