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#51
These you can try:
1. Try safe mode, if you remember your "Administrator" account and its password, use it, then when inside, check your user profile, reset the password if need be.
2. Once you can get into your working Windows 2000 installation, install VirtualBox Additions (it's the supplement package every VMM have, drivers, etc).
3. In the "Settings" => "Network", choose "Bridged Adapter", this way your VM will be connected directly to your LAN, bypassing your Windows 7's network stack.
4. For the "Host Key", you can change it in File->Preferences->Input. Highlight the "Host Key" box, press your desired key (use rarely used keys, like right shift, or F12, etc)
When you installed the VirtualBox Additions, your mouse will be captured and released automatically, as if the VM is an application window.
zzz2496
Edit: This is done INSIDE the VM, OK? :)