Bill,
I do not think there is anything in the downloader that would be hardware specific.
Differences to be reckoned with, include:
Operating Systems (and specific settings within Operating Systems)
Mainboards
BIOS settings
Antivirus, Spybot, Spambots, Adaware Software
Firewalls
Different types of HD, RAM
Memory management software
Other background programs
et al.
Start by looking at these things and making any settings on the slow machine the same as the fast machine (where possible)
Other than that, hire a tech to come to your house and look for the solution on site. We can only spruik ideas here, without having access to both machines and the data feeds... etc
wabbit
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