Beste Jion, 
Bedankt voor de snelle reactie. 
Hierbij de log: 
code] 
HitmanPro 3.7.3.194 
www.hitmanpro.com 
   Computer name . . . . : ALPITEC-PC 
   Windows . . . . . . . : 6.1.1.7601.X86/2 
   User name . . . . . . : NT AUTHORITY\SYSTEM 
   UAC . . . . . . . . . : Disabled 
   License . . . . . . . : Trial (30 days left) 
   Scan date . . . . . . : 2013-04-25 14:12:21 
   Scan mode . . . . . . : Normal 
   Scan duration . . . . : 3m 55s 
   Disk access mode  . . : Direct disk access (SRB) 
   Cloud . . . . . . . . : Internet 
   Reboot  . . . . . . . : Yes 
   Threats . . . . . . . : 2 
   Traces  . . . . . . . : 5 
   Objects scanned . . . : 1.581.034 
   Files scanned . . . . : 14.848 
   Remnants scanned  . . : 325.049 files / 1.241.137 keys 
Malware _____________________________________________________________________ 
   C:\Users\Alpitec\AppData\Roaming\AltShell.dat -> Quarantined 
      Size . . . . . . . : 45.056 bytes 
      Age  . . . . . . . : 0.1 days (2013-04-25 11:18:03) 
      Entropy  . . . . . : 7.3 
      SHA-256  . . . . . : 4463FC32685BCAC43AD56E9AD130A9DF682DF96F2A78A197233A7BFB6AC3BE00 
      Parent Name  . . . : C:\Windows\System32\userinit.exe 
      Running processes  : 2188 
    > HitmanPro  . . . . : Win32/Ransomware.Behavior 
      Fuzzy  . . . . . . : 64.0 
         Substitutes Explorer.exe as the default shell. Malware tends to start this way. 
         This file was most recently added as automatic startup. 
         The file name extension of this program is not common. 
         Entropy (or randomness) indicates the program is encrypted, compressed or obfuscated. This is not typical for most programs. 
         Program is running but currently exposes no human-computer interface (GUI). 
         Authors name is missing in version info. This is not common to most programs. 
         Version control is missing. This file is probably created by an individual. This is not typical for most programs. 
         Program starts automatically without user intervention. 
         Time indicates that the file appeared recently on this computer. 
         The file is in use by one or more active processes. 
      Startup 
         HKU\S-1-5-21-3062237543-739346878-37038767-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell 
      References 
         C:\Users\Alpitec\AppData\Roaming\AltShell.ini 
      Forensic Cluster 
          0.0s C:\Users\Alpitec\AppData\Roaming\AltShell.dat 
          0.6s C:\Users\Alpitec\AppData\Roaming\AltShell.ini 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\a-squared.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\adaware.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\arcavir.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\av_noav.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\avast.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\avg.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\avira.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\bitdefender.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\clamwin.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\comodo.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\drweb.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\error.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ewido.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\f-prot.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\f-secure.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\gdata.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\header.jpg 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_1.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_1.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_10.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_2.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_3.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_4.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_5.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_6.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_7.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_8.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_2_9.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_3_1.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_3_2.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_3_3.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_3_4.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_3_5.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_3_6.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ic_5_1.jpg 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\ikarus.png 
          3.1s C:\Users\Alpitec\AppData\Local\Temp\index.html 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\kaspersky.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\mcafee.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\me_error.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\me_notice.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\mse.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\nod32.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\norton.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\nosignal.jpg 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\notice.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\onecare.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\outpost.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\panda.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\sophos.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\style.css 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\trendmicro.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\vba.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\vexira.png 
          3.2s C:\Users\Alpitec\AppData\Local\Temp\zonealarm.png 
          4.1s C:\Users\Alpitec\AppData\Local\Microsoft\Windows\History\History.IE5\MSHist012013042520130426\ 
          4.1s C:\Users\Alpitec\AppData\Local\Microsoft\Windows\History\History.IE5\MSHist012013042520130426\index.dat 
   C:\Windows\system32\.exe -> Quarantined 
      Size . . . . . . . : 39.558 bytes 
      Age  . . . . . . . : 606.6 days (2011-08-27 22:41:56) 
      Entropy  . . . . . : 6.8 
      SHA-256  . . . . . : ECBE0AFA6BBBBF0F0E5FFF12081E9020C61571A6291605A6BD0C179288A550D5 
      Needs elevation  . : Yes 
    > Emsisoft . . . . . : Malware.Win32.AMN!A2 
    > G Data . . . . . . : Trojan.Generic.6579245 (Engine A) 
      Fuzzy  . . . . . . : 108.0 
Is het nu volledig opgelost? 
Bedankt voor de hulp!