Hi, I believe I know why my installation doesn't work: It's not the installation, but something with Windows. I use for years "Windows 7 Ãdition Familiale Premium 64 bits Service Pack 1" without the slightest problem. But what I use my computer for is simply writing text, taking pictures and exchanging mails; nothing to do with programming. The conclusion, I think, is that some settings of Windows should be modified to adjust to these added uses. The complication is I'm no specialist of Windows; I just use it. That's why I would like a person knowledgeable in Windows AND Pharo, who could check my installation and correct it as needed. To that end we could use "TeamViewer": it wouldn't be overly long or too disturbing for the person. I am very grateful to the person who will accept to help me. Regards, Mark