PS PM me if you want Ricardo's number and I am sure he will be able to fix you up - he's on BA Expats but I forget his handle now - I *do* remember it has ''notebook'' in it from memory...
No need to dive straight into it, suggest you first install a Virtual Machine (VM) in Windows and make it Ubuntu's home until you feel comfident using it.
You need somebody who can reinstall your remote wordpress site from backup and patch it against a known exploit.
You are looking not for a "computer techician", but for a "wordpress expert".