Seamus Andrew

I have been palying in secondlife for several years, now more of an occasional visitor. Last tiem I logged on found soem people in my hosue, chatted to them but when they left my game crashed and I cant get back on. I can log on and as the game loads i get to the message loading world, then my computer screen freezes and I can do nothign but press, contl alt delete to return my computer to normal. Has someoen been messing with my game am I blocked does anyone have any suggestiosn what I can do. I have uninastalled the game and installed it again, even logged on as a new character but each time access is denied.