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Are you using a desktop or laptop PC?
Have you checked if the camera will still connect to other computers ok?
Ok, what viewer are you using?
... and please confirm the PC type - laptop or desktop?
Ok, first check if there are any windows waiting at the bottom of the screen asking you what to do next....
if there are, you will need to click OK on those when you connect the camera - this is a security feature in Windows to prevent unauthorised devices connecting.
Ok, let me know how it goes with the laptop.
Alternatively, does the Acer All-in-One have a card reader that you could slot the camera's memory card into?
This would make accessing your photos easier.
Or, if you have a card reader handy, similar to one like this:
Ok, it doesn't look good if it won't connect to any computer at all - possibly a card corruption.
Do you have a different memory card you could try in the camera?
The USB connection is "universal" across all Windows systems and other operating systems, so you don't need an emulator.