Most laptops have universal power adaptors so it should work as long as it can cope with the local voltage ie 110 volts at 50hz. It will say on the adaptor what voltage it will accept. Acer do a European warranty so it doesnt matter where you are it can be repaired.
Personally I would stick with XP, especially for a laptop, and get an Intel one as it runs cooler and quicker. Look for one with at least 1GB RAM, preferably 2GB (but its easy to add more)