It would seem I have been hacked.

I went to login to my gmail account and it told me my password was wrong. I typed it again and again and again and again but still no avail. I done the whole "I forgot my password" process and it asked me the secret question, in which I answered...incorrect. "I don't think so" I typed it in again, incorrect.

I got annoyed, shut my PC down, made a Pot Noodle and watched Porn on Channel 5.

I then went down the "retail theropy" route a couple days later, found something on eBay I fancied. Went to buy, "Please Login" I typed in my details, Incorrect. "Oh, FFS!" Tryed again and again and again. Still no go.

I haven't got Caps Lock on or anything. But I seem to remember when I was working in the Office (not the Office, but in an Office) I had problems logging into any kind of sucure network, it turned out my co-workers brat of a child had been using my PC on my day off and had changed the security settings by "accident" These were then changed back and I could login again.

The one string of hope I have is that somehow my security settings have gone haywire. In the Office (not the Office, but in an Office) we used FireFox (Grrr...) and it was easy to change. But could someone point me in the direction of what my security should look like.

I'm 90% sure its been hacked into, but I am just hanging onto small hopes right now.

I've just gone on to www.e36coupe.co.uk and went to login to find my details were incorrect...

That sounds like someone has hacked you probally
What I expect is that someone has puted a key logger on your system, and then he can see whatever you type, like passwords etc etc. Aswell he probally have gained most information from your computer, so that means that he can probally change every site and forum you have been on. But look on the bright site here, you still got this forum
Sorry for the joke tho, it sucks to be hacked ./

I doubt you've been hacked. If all these sites have the same password are you sure you've not forgotten it? Try opening up notepad and check that all your keys are working and that you've not been missing out a letter due to a dodgey keyboard.

They all pretty much have the same password and I know my keyboard is working

If you used remember my password in firefox anyone who has access to that PC can see your password, the only thing that they have to do is go to Menu Options > Tab Security > Button Show Passwords and then again show passwords. So if you had them stored that could have been the source of you password leak.