I will tell you in this post how to fix the issue manually and how to clean it automatically using a special powerful removal tool. You can download the removal program for free here:
The file SIHOST.EXE is identified as the Trojan Program that is used for stealing bank information and users passwords.
To delete SIHOST.EXE we suggest you should use UnHackMe:
http://www.unhackme.com
Malware Analysis of SIHOST.EXE
Full path on a computer: %APPDATA%\{%USERNAME%-FHLOLKJASFLKJWEFLKJWHGF}\SIHOST.EXE
Detected by UnHackMe:
After first reboot detected by UnHackMe:
SIHOST.EXE
Default location: %APPDATA%\{%USERNAME%-FHLOLKJASFLKJWEFLKJWHGF}\SIHOST.EXE
Removal Results: Success
Number of reboot: 1
SIHOST.EXE is known as:
Trojan.HLLW
Will you remove it?
People say
How to quickly detect SIHOST.EXE presence?
Files:
Files:- %APPDATA%\{%USERNAME%-FHLOLKJASFLKJWEFLKJWHGF}\SYSINFO_FHLOLKJASFLKJWEFLKJWHGF.INF
- %APPDATA%\{%USERNAME%-FHLOLKJASFLKJWEFLKJWHGF}\SIHOST.EXE
I use UnHackMe for cleaning ads and viruses from my friend's computers, because it is extremely fast and effective.
STEP 1: Download UnHackMe for free
UnHackMe removes Adware/Spyware/Unwanted Programs/Browser Hijackers/Search Redirectors from your PC easily. 
UnHackMe is compatible with most antivirus software.
UnHackMe is 100% CLEAN, which means it does not contain any form of malware, including adware, spyware, viruses, trojans and backdoors. VirusTotal (0/56).
System Requirements: Windows 2000-Windows 8.1/10 32 or 64-bit. UnHackMe uses minimum of computer resources.
STEP 2: Double click on UnHackMe_setup.exe
You will see a confirmation screen with verified publisher: Greatis Software.
Once UnHackMe has installed the first Scan will start automatically
STEP 3: Carefully review the detected threats!
Click Remove button or False Positive.Enjoy!