Aiuto con Antivirus e HijackThis please

[Sono un umpalumpa]

Non ho un antivirus attivo sul mio pc perchè non so quale mettere. Sta di fatto che penso sia infetto perchè mi si aprono continuamente finestre addirittura da un altro browser. Ho scaricato hijackThis e ho eseguito una loglife (la copio qui sotto) che non so leggere e decifrare. Qualcuno mi potrebbe aiutare per favore? grazie mille in anticipo :)

Logfile of Trend Micro HijackThis v2.0.4
Scan saved at 21.15.08, on 26/08/2014
Platform: Unknown Windows (WinNT 6.02.1008)
MSIE: Internet Explorer v11.0 (11.00.9600.17239)
Boot mode: Normal

Running processes:
C:\Program Files (x86)\Common Files\Apple\Internet Services\iCloudServices.exe
C:\Users\Virginia\AppData\Roaming\Spotify\Data\SpotifyWebHelper.exe
C:\Users\Virginia\AppData\Roaming\Spotify\spotify.exe
C:\Windows\SysWOW64\rundll32.exe
C:\Program Files (x86)\Sony\ISB Utility\ISBMgr.exe
C:\Program Files (x86)\Sony\PlayMemories Home\PMBVolumeWatcher.exe
C:\Program Files (x86)\Intel\IntelAppStore\bin\ismagent.exe
C:\Program Files (x86)\iTunes\iTunesHelper.exe
C:\Program Files (x86)\fst_it_235\fst_it_235.exe
C:\Users\Public\Documents\AppData\PoApp\PService.exe
C:\Users\Virginia\AppData\Roaming\Spotify\Data\SpotifyHelper.exe
C:\Users\Virginia\AppData\Roaming\Spotify\Data\SpotifyHelper.exe
C:\Users\Virginia\AppData\Roaming\Spotify\Data\SpotifyHelper.exe
C:\Users\Virginia\AppData\Roaming\Spotify\Data\SpotifyHelper.exe
C:\Users\Virginia\AppData\Roaming\Spotify\Data\SpotifyHelper.exe
C:\Program Files\Sony\VAIO Care\listener.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
C:\Users\Virginia\Desktop\HiJackThis.exe