czaderak

Click "windows button" then write in "msconfig" and press enter. In second tab there should be something like "advance options" and when u click it there's option in polish called "liczba procesorów" (sry not english user) in english probably something like "core number" set it to maximum possible and it should help a bit. If not I strongly suggest looking for SSD.

It's a chemical thing Source: Charging Lithium-Ion Batteries

It's usually problematic to boot w7 that was installed on one laptop on another laptop due to hardware differences. What you're talking about are probably OEM versions which are additionally protected from being booted on different PCs. Internet is right - if you want this to work you probably have to install w7 once again.

Check this out: Download Video Memory Stress Test - MajorGeeks

Never heard of "blind" flash drive booting. The only thing that comes to my mind is this: How to Repair Corrupted BIOS Firmware: 8 Steps (with Pictures)