Win32:evo-gen removal help

I bought an HP laptop with windows 8 (upgraded to 8.1) last June and my girlfriend and I used it quite a bit until recently, when I was able to get my desktop set up. Now, she mainly uses the laptop under her own user account. It has the free version of Avast as the main AV program. Lately, when she first gets into her account, it sends her an alert that it has blocked the win32:evo-gen Trojan. To my knowledge, only her account does that. Now, I have tried following several instructions to get it removed but to no avail. However, when I tried to get into safe mode with networking, the laptop will not go in to safe mode with networking, only regular safe mode. I'm not sure if that is due to the Trojan or not. I tried two different approaches 1) press shift while restarting and 2) run msconfig, then hit the boot tab and check off safe mode and networking, then restart. Simply cannot get the networking with safe mode. So, I tried working in just safe mode by downloading malwarebytes to a flash drive from my desktop and running it on the laptop but the program won't run for some reason. It will on my desktop, though. Very weird situation. So, I'm not sure if the Trojan virus has anything to do with it or if there is something going on with the Windows 8 program. For scanning, I use superantispyware and malwarebytes and both don't seem to find it.

She can still use the computer but something is causing Avast to continually block the win32:evo-gen trojan. Any help is appreciated.