How do I get my old Acer Aspire M1610 back up and running. It will power on, and I can access the BIOS.However upon opening the case found hard drive had been removed (probably by me years ago) Can't find original OS disc - case label says Windows Vista Home Basic - but can't remember which OS was running on it when last in use. Just want to use as a basic functioning PC really. I am against adding this to landfill - too much usable items get trashed in this throw away society. How can I install an OS and get it running ?