Not sure what you mean by "everything" By "pc" I guess you mean personal computer. Doing this may damage the computer, but not anything else in the building. If you're lucky, the computer's internal power supply may be fused, and maybe just the fuse blew.
Every outlet in your house, and everything in your house that's plugged into an outlet, is in parallel.
You will burn up your appliance!!!!!
It may work but will probably surge it...power coming in from both directions
Absolutely not. The plugs are incompatible for a reason. The unit will be fried and a fire may result. Find a 115 outlet.
It is likely broken if there is power to the outlet
That happens when the appliance supplied by the outlet is switched off.
No. Attempting to run an appliance on insufficient voltage can cause damage to the appliance and can be dangerous. Call an electrician and get him to install a 220v plug
plug it into any outlet
Powed cords always plug into an outlet.
Plug a plug in an outlet :)
You plug it in your plug outlet
an AC Adapter allows you to plug your computer into a standard wall outlet