My PC just restarted and created a dump file. I changed the extension (dmp) to txt, so that I could upload it here. Please someone take a look into it and tell me what is it. Thank you! 
Pretty please. 
It seems that the problem doesnât occure anymore, so please tell me if should I remove this from my startup:
O4 - HKLM..\Run: [KernelFaultCheck] %systemroot%\system32\dumprep 0 -k
Thanx.
Will someone help me please? 
Personally if it were me I would first go to that registry key and export it as a .reg file in case I had to use it again and then I would delete the entry.
HiâŚ
I donât know know how much help Iâll be but I did look at your file and it appears to be a driver issue. What I did find peculiar was this line:
âMdl Ă Ăuâ Ăuâ Ă \g eOsĂĂŠMĂËWin32:Sasser [Wrm] E 'žVÂKĂcĂ´Ââ Ă`ÂŹâşâĆb´âcœÿHVĹ Ă(â˘bĂZWin32:Blaster-D [Wrm] â
Did you install anything just prior to this event?
EDIT: Nevermind, I just now saw that the problem no longer occurs. I would concur with Davidâs advice.
RegardsâŚ
Which registry key? I found that line in CCleaner, I didnât go to Windows registry. And yeah, I hope that the problem wonât occur anymore.
Iâm a bit worried about that line, it seems like a virus, doesnât it? Was that writen in the dump file?
Thank you both for help!
Sorry I though you had created this so it would generate a dump file to troubleshoot a problem.
If you fully expand the registry key path found by ccleaner the ..\ bit is a concatenation with the full path you should be able to follow that like you would in explorer.
However, if you leave that entry there and clean all the other stuff shown by ccleaner. You can run ccleaner again and only that entry should be there, now you can clean it ensuring that ccleaner makes a backup of it.
Iâm sorry, I donât fully understand⌠That entry was created when my PC rebooted, when the minidump was made. So, should I delete it or leave it there?
AS I said in my above post (paragraph beginning However), yes but only after making a backup via ccleaner
I donât know how to make a backup in CCleaner. 
And for what purpose anyway? Wonât the system itself create that line again if something like that occurs again?
Presumably you found it using the Registry function, well backups are incorporated by default confirmation. If after running this check it will report any issues and the box to the left will be ticked/selected, you you click the Fix selected issues you get the confirmation âDo you want to backup changes to the registry?â window, see image.
So it isnât a problem to backup any issues that you elected to fix.
Why backup, simple it is good practice as one day it will bite you in the ar*e when you donât if you ever need to reverse the change. I donât second guess the registry and when working in it I always backup.
That entry is found in CCleanerâs Tools â Startup section, not in the registry section. Thank you anyway, I now realised that I can just disable that line in CCleaner and later - if everythingâs working fine - I can delete it. Thanks!
How about posting an image so we can see exactly what it is, it is essential that we are able to see the full data on that line and not a concatenated /âŚ/ one.
OK, I was hoping it would be a little more helpful with some reference to what might have set it.
It may be that there has been some OS setting changed to initiate this check, see this link about it and how it is set or conversely removed, http://www.raymond.cc/blog/archives/2008/03/04/what-is-dumprepexe-why-is-kernelfaultcheck-dumprep-0-k-in-msconfig-startup/. Your System Startup and Recovery setting may have been set to do a Kernel Memory Dump.
The main thing it doesnât look to be maliciously set as I canât see a purpose for this if it were set maliciously.
Thank you for a great help as always, David.
Youâre welcome.