Cannot delete quarantined threats AND Error Signature

[Bin]

I am a new user to Malwarebytes' Anti-Malware. In my previous scan, Malware.Trace and Trojan.Cinmus were detected and quarantined. I tried to delete the threats by both Delete and Delete All option. After Clicking the button, the files are wiped out but they come back again when I clicked in the quarantine section. I have no problem to delete other quarantined threats.

My second problem is I cannot run a full scan; Malwaregytes stops after scan about 10K files. I tried several times and the problem happen again. The communication box shows the following error message:

Error Signature Event Type: BEX P1: drwtsn32.exe P2: 5.1.2600.0 P3: 367d84a2 P4: dbghelp.dll P5: 5.1.2600.5512 P6: 4802aOb2 P7:0001295d P8:C0000409 P9:00000000

And it also mentioned the following files (drwtsn32.exe.mdmp and appcompat.txt) will be included in the error report.

The Malwarebytes Anti-Malware's version is 1.46 and the PC is running with Windows XP with sp3 installed.

Thanks for advice.

[Firefox]

Hi, and Welcome to Malwarebytes!

Since the infection keeps coming back, you probably have a rootkit or some other malware on your computer....

Please read the following so that you can begin the cleaning process:

As we don't deal with malware removal in the General Malwarebytes' Anti-Malware Forum, you need to start a topic in the Malware Removal forum so a qualified helper can help you fix any malware related problems/infections you may have.

• Please read and follow the directions here, skipping any steps you are unable to complete. Then post a NEW topic here.
  
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• One of the expert helpers there will give you one-on-one assistance when one becomes available.
  
• Please refrain from making any further changes to your computer (Install/Uninstall programs, use special fix tools, delete files, edit the registry, etc...) unless advised by a malware removal helper. Doing so can result in system changes which may hinder the attempts by a helper to clean your machine.
  

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