"Tro_ski" wrote in message
...

I reformat my system to keep it running smoothly every 6mths, I've noticed
that the computer often slows down from all the constant downloading from
the
family.

Then you need to place some restrictions on it. As DL said, physically
downloading a file does not slow a computer down in itself - any associated
malware or viruses will though.
I bet they all log in as an administrator too, don't they?