I just called TomTom support, I was instructed to hold the reset button on the bottom of the unit for 15 seconds and then reconnect the GPS to my computer. It worked, TomTom Home opened and I was able to apply the updates.
I had a similar problem with my 520GO. After a year with no problems all of a sudden my computer would not recognise it and it wouldn't connect to my phone by Bluetooth. Tried Tom Tom - no use! I had UK maps on the device and Western Europe on an SD card. By chance I removed the SD card and everything worked as normal. It's worth a try......!!
It could be a drver issue or a IRQ issue. Try unpluging a usb device that you don't normally use for a moment to see if this takes off.
Go to the tom tom website and download the correct driver. I know on garmin's they have a scanner there website to find out what model number that you plug in.
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