Vista BSOD - problem with avast5 free 5.0.377

Hi. I can not speak English very well so excuse me. I installed avast on the friend laptop 5 (I uninstalled avast 4) and the work of around 10 minutes to the BSOD occurred. whereas from him, I could not connect to the forum so I can copy the avast on the flash key. say what I give to the ftp server avast and I did so the file contains a dump file that you can specify problem? I appreciate your cooperation. BSOD done only 1 time. no more at least not yet. should minimize the occurrence of BSOD

minidump in windows folder is empty