didn't i see an option to run a memory diagnostic test in one of the menu's you can get to?
if not then you'd need to download and burn another piece of software to test it.
tell you what can you download suse kde live from here :- http://software.opensuse.org/132/en
you need to click on the Click here to display these alternative versions. link then click LIVE KDE then click the Download
burn the iso to cd as an image and boot that, it will have a memory test option on it's menu, last option.
also with that if you choose the first option you can test the drop didn't damage anything else hardware wise and your laptop works fine.
DO NOT use option 2, installation, for any reason, we do not want to risk damaging the installed os any more than it is, all other options won't touch your hard drive.
once we know the memory passes ok and option 1 runs in memory and takes you to a desktop then it's probably a bad burn with your repair win 7 cd and why it doesn't get us to where we need to be.
didn't you say you can get hold of a windows install cd from a friend or relative? if so then it might be worth waiting until you can get that before going any further seeing how everything else you've tried seems to fail so far.
Edited by terry1966, 09 April 2015 - 10:10 AM.