Hello all, My pc has been having frequent minidumps, sometimes several a day. The most common reasons are IRQL_NOT_LESS_OR_EQUAL and APC_INDEX_MISMATCH. Sometimes it's CACHE_MANAGER. My pc is Zoostorm G31 VB series M8 Intel Celeron 512 MB 32 bit OS Vista Home Basic. I have the free version of Avast anti virus. When I try to access the minidump files, I get a window saying windows cannot open the file and needs to know what programme I want to use to open it. I don't know much about computers. Please can anyone help me?