Ok larilucena, we have multiple problems here and multiple solutions.

First, you are running outdated Windows 8.
Windows 8 Single Language (X64) OS Language: Portuguese Brazilian
Internet Explorer Version 10

The current version is Windows 8.1 Update (chain of updates: Windows 8 >> Windows 8.1 >> Windows 8.1 Update) and IE11 (desktop and metro) browser.
The upgrade is free and it can be reached using Windows Store app, or applying Windows Update service (WUP). This also might solved a lot of problems because it will be done some form of light reinstallation. Do not worry, all your personal setings of programs, files …etc shall be saved. You lost nothing.

Then we can also preform refresh or reinstall using Modern UI settins … but we’ll talk abaut that later if there is need for that operations.

Before you go for upgrading your system which is mandatory (and free), I would like you to preform some fixes. This time we will use FRST tool to do that…
FRST shall also target the detected malware (Win32:Malware-gen) in case avast didn’t. The (FileRepMalware) detection is some kind of FP, do not pay attention to that yet…

First from Control Panel access to Programs and Features. From there uninstall Update for PriceMeter.

Then …

1. Open notepad and copy/paste the text present inside the code box below.
To do this highlight the contents of the box and right click on it. Paste this into the open notepad.
NOTICE: This script was written specifically for this user, for use on that particular machine. Running this on another machine may cause damage to the operating system


Start
File: C:\Windows\System32\wermgr.exe
File: C:\Program Files (x86)\Samsung\Settings\CmdServer\EasySettingsCmdServer.exe
File: C:\Windows\System32\IccLibDll_x64.dll
(Microsoft Corporation) C:\Windows\System32\wermgr.exe
C:\Users\Lala\AppData\Local\GAS Tecnologia\GBBD\bb\sf.crx
C:\Users\Lala\AppData\Roaming\asfkjowea.exe
C:\Windows\Temp\SBIOSIO64.SYS
C:\Users\Lala\.android
C:\Users\Lala\AppData\Roaming\aiasfacoiaksf.vbs
Task: {01F6762B-6294-4321-BC9C-D2A710DDB0C7} - \pricemeterdownloader No Task File <==== ATTENTION
AlternateDataStreams: C:\windows\System32:98CC9D4F_Bb.gbp
C:\ProgramData\FileSplitUpLoad.dll
C:\ProgramData\MakeMarkerFile.exe
C:\Users\EasySurvey\EasySurvey.exe
C:\Users\Lala\AppData\Local\Temp\dropbox_sqlite_ext.{5f3e3153-5bce-5766-8f84-3e3e7ecf0d81}.tmp34_axn.dll
C:\Users\Lala\AppData\Local\Temp\Quarantine.exe
Winsock: Missing Catalog9 entry, broken internet access. <===== ATTENTION.
Winsock: Missing Catalog9-x64 entry, broken internet access. <===== ATTENTION.
CMD: netsh winsock reset
CHR HKCU\...\Chrome\Extension: [pgacfjdigcddmmncljpflgcfpfahebkh] - C:\Users\Lala\AppData\Local\GAS Tecnologia\GBBD\bb\sf.crx [2014-03-15]
S3 SBIOSIO; \??\C:\Windows\Temp\SBIOSIO64.SYS [X]
Reboot:
End

2. Save notepad as fixlist.txt to your Desktop.
NOTE: => It’s important that both files, FRST and fixlist.txt are in the same location or the fix will not work.

3. Run FRST/FRST64 and press the Fix button just once and wait.
If the tool needed a restart please make sure you let the system to restart normally and let the tool completes its run after restart.

The tool will make a log on the Desktop (Fixlog.txt). Please attach it to your reply.
Note: If the tool warned you about the outdated version please download and run the updated version.