My mouse stopped working. I tried changing to another mouse but have the same problem. I've tried every USB port but that makes no difference. Occationally I can get it to work for a few seconds, but notlong enough for me to do anything. Could it be I need more memory? Before this started, it was an occasional thing. I started deleting unused games and other unused files. Now I can't get anything out of it. I did get it up in safe mode and ran a virus scan but it came back ok. Any suggestions?