Safari and Chrome crashing

This question is about my Mac Mini mid-2011 version. From the first day I had this mac, safari and chrome keeps crashing, and it does this repeatedly until i close the browsers. When Safari crashes, this comes up: http://pastebin.com/qUPEhpcr

The ram i use is installed myself, and seems to be working. Can this crashing have to do with the ram?

The mac was also recently in to service, and got a completely new hard drive, which I thought maybe solved this, but it didn't, so it doesn't have anything to do with the harddrive.

I have also reinstalled the system 4-5 times as the mac keeps crashing quite often.

When I recived the mac, it was running Lion, but now it's running Mavericks, and I still have this problem.

(Sorry about my bad english, it's not my native language)