Vaughan, its very unlikely your Moodle Partner would have given you raw access to the server files where you can copy/paste the temp/raw files to site folders.
Once this issue gets resolved, chances are that your moodle partner would do it for you automatically, else you can always raise the ticket for upgrade.
Marcus, in this scenario, crashing could have halted the server to serve any more pages, as LOAD on server doesnt produce any errors or bugs for your moodle site, but you generally get error like server not reachable etc, as the load gets heavy on server, the server tries to process all requests until they get so many to bring server to a halt. As when load minimizes, server comes back to normal operations.
Martin, XAMPP is never recommended on Production sites, its just for desktop environment to test the PHP/MySQL codes.
you can install Apache, PHP and MySQL standalone, if you are aware of configurations then very well. or get someone to do this for you.
if you are not comfortable doing configurations, then in terms of hardware, I would definitely recommend adding another drive and setting up RAID-1
Kishore, What Gareth said is, you may be trying to access the site by using 2 different URL's, like for example from Internet, it may be accessed via URL like (www.mymoodle.com), whilst on your LAN, you may be accessing it via (http://myserveraddress/moodle).
its Moodle 2.5 with Essential 2.6, as with Essential 2.6.1 and Moodle 2.6, the issue is something else which I did wished to be solved and Mary did tried, but it still remains there.