You could do your degree in the UK. That's basically your only option if you don't want to get married. You can't qualify for a Tier 2 as an IT help desk worker or systems administrator. There are plenty of people in the UK and EU who can do those jobs.
Depends on the
experience, my partner is a sysadmin manager and one of his top guys is on a tier2 visa. Though, software they mainly work on is Linux based, which is more common to those outside the US.
Though, if youre able to open your places to live outside London, your opporutnities might be larger. Sheffield, for example, is pretty much a centre hub for open source based companies.
http://www.wandisco.com/careersTheyre based in Sheffield and I know theyre hiring across the US and the UK. If youre near any of their offices, it might be worth applying if it meets your skill set.
IT seems to be a workforce of who you know
AND what you know. If youre not on linkedin, GET there. My partner constantly gets headhunted on there for work in the UK, EU and further afield.
Start networking, the
sooner the better. If you dont want to move over on a marriage visa, this is your
only option. You're on helpdesk support at the moment, is there any way for movement to improve on your skillset at your current job? (helpdesk only earns about £17K a year here and that includes working a shift pattern of all sorts of hours over the whole year)
If you want to continue your education, look into universities who have your program of choice and move over. Its not cheap for foreign students and you will need loans. You can work 16 hours a week under a student visa (and full time hours when school isnt in session) so you might be able to still do helpdesk support while here and studying.
Never, say never.
Though be warned its a hard market here, so be warned if you do make it over on a family visa.