probabile causa...è successo anche a me avevo applicato la soluzione presa dal forum di steam che ti riporto:
The new "\AppData\Roaming\Steam\Reversed\steam.exe" BitCoin malware: How to detect and remove it
What is it?
There's some new malware going around that uses your GPU to mine for BitCoins. Even while idle, you'll see spikes around 90-95% in GPU usage. During games, this can be devastating and reduce your performance to almost nothing. In my case, League and TF2 were both dropping to around 30FPS thanks to VSync. Without VSync, they'd stutter horribly between 20 and 50. Another user claims to have been infected with it the same day I had:
Suspicious steam.exe programme detected!!! :: Help and Tips
What does it do?
It somehow installs itself and mines for BitCoins. That's pretty much it. It's pretty easy to know when it's on your system because it's barely usable. I don't know how it gets there because I wasn't using the computer at the time of infection.
How do I find it and remove it?
Nov 29 2014 Edit: Users are reporting they also find it in appdata/winrar and appdata/adobe folders. Your antivirus will likely be able to locate it, but it wouldn't hurt to look around and report in this thread where you found YOUR executable.
Navigate to \AppData\Roaming\Steam\Reversed. Once there, delete it. It doesn't appear in msconfig as far as I can tell, so you'll have to manually remove it from the directory. Once removed, run a scan with free antimalware such as ComboFix or Norman Malware Cleaner or AVZ:
http://support.kaspersky.com/common/service.aspx?el=1698#block2, and MBAM(uncheck pro trial):
https://www.malwarebytes.org/mwb-download/. Heck, run all of them.
Edit: It also stores itself in your System32/Tasks folder:
http://www.cyberforum.ru/viruses/thread1242413.html. You'll have to delete these as well to prevent it from updating and re-installing if your scan doesn't catch these.
More information, translated from russian:
Google Translate
