Hi,
Sorry to say that u have mentioned ur problem with too little information. I think the download box disappearing is due to poor network connection. Also, it happens sometimes without any reason. What u can do is use a good dwnld manager.
I think there is memory leak problem with ur Laptop. Thats why the install box disappears. Does this happen every time?
Bye
Hi,
Also try using Avast 4.8 Home as ur AV. Update the AV on daily basis. It could very well be that there is a virus in ur Laptop.
Bye