|Yeah, it doesn't sound like a ram-addressing issue since you've been running the same basic system for awhile. Something new is occupying cpu time or ram. It probably wasn't vacuuming the computer. Although that's not a good idea I think if that had caused damage it would have been much more severe than just slowing the mouse down. It might be the broadband switchover. Maybe there's remnants of the old software trying to run?|
I believe windows 7 still has MSCONFIG but you have to do a search to find it:
Run msconfig to see what's running on startup. You might want to check in task manager also.
I just thought of something else that should have occurred to me earlier. It may be a shared irq issue. The mouse and something else may be using the same IRQ and that other piece of hardware's demands on the OS are interferring with the mouse's operation. I don't know if this applies to your situation but you can take a look:
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