Last week I purchased my brand new SONY VAIO laptop. It is running 64 bit windows 7 Ultimate in it. It was working perfectly fine till yesterday, but when today morning I started browsing the folders which have files with large size; 5GB files like HIDEF mkv files (movies), then the Windows Explorer terminates and restarts. What must be the reason behind this problem? Does anyone have solution for this issue? Please help me with your suggestions as they are always appreciated with me.