explorer.exe crash, with BSOD after some time

Ok, so I downloaded Opera browser from the official site link. After that, a message appears saying that Windows Explorer has stopped working. Closing the program just shows up the box, and Explorer doesn't close. Here's the problem :

Problem signature:
Problem Event Name: APPCRASH
Application Name: explorer.exe
Application Version: 6.1.7601.17567
Application Timestamp: 51e7f50c
Fault Module Name: StackHash_0a9e
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 00000000
Exception Code: c0000005
Exception Offset: 001b0f02
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1071
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789

Read our privacy statement online:
Windows 7 Privacy Statement - Microsoft Windows

If the online privacy statement is not available, please read our privacy statement offline:
C:\Windows\system32\en-US\erofflps.txt

I also can't use most of my programs. There is also a second explorer.exe in the Task Manager. It uses about 800 KB RAM.

Can anyone help?

Ok, so I was out of my country for a week, so here it is.

Attachment 334525

OK, I edited it. That standalone text file didn't help a lot.