I opened an app, which crashed, so I turned my phone off. When I turned it back on, it took ages to start up and then I was confronted with the 'Welcome to your android smartphone' screen. After a small panic, turning it off and on again, I followed the onscreen instructions and set up my google account again and found all my settings and apps were still there, kind of, but now nothing works. 
I think it's the internal memory that caused the problem, I knew I hadn't much space left, but it must have been full... Now none of my apps that use internal memory will open, some apps haven't appeared at all and I am receiving a stream of 'Force Close' messages even when I'm not trying to do anything. When I go into Gallery, no data from the internal memory shows up, making me worry that I lost all my stuff.
I took the microSD card out and took things off it, but everything with the SD card seems fine. I plugged the phone into my laptop, connected USB and started moving my photos and videos over (of which I have a lot). All the data is in the internal memory when I view the folder on my laptop, but doesn't appear to work when the phone's in use. I deleted about 400 photos, but I cant get any more off my phone - everytime I start the copying process, the phone disconnects itself from the computer after one or two files!? This means that there's about 2GB of mp4 video on there that I can't delete in Gallery because it doesn't seem to exist there, and I can't delete by connecting USB storage because the connection stops whenever I try to do anything
This has me baffled...
It came from nowhere and I feel like I've tried everything. I turned it on using the safe mode thing (holding volume+, home and power), and rebooted it - but that had no effect. I removed about 12 apps to clear space. In settings, it says there is 1.15GB of free internal memory, so atleast the phone knows the internal memory is there. I'm not a tech genius and need some help. I don't want to do a factory reset because there's stuff on the internal memory that I do not want to lose (like the videos), but it's starting to look like the only option...
Suggestions? Or explanations? Or anything really I'm so fed up with this

I think it's the internal memory that caused the problem, I knew I hadn't much space left, but it must have been full... Now none of my apps that use internal memory will open, some apps haven't appeared at all and I am receiving a stream of 'Force Close' messages even when I'm not trying to do anything. When I go into Gallery, no data from the internal memory shows up, making me worry that I lost all my stuff.
I took the microSD card out and took things off it, but everything with the SD card seems fine. I plugged the phone into my laptop, connected USB and started moving my photos and videos over (of which I have a lot). All the data is in the internal memory when I view the folder on my laptop, but doesn't appear to work when the phone's in use. I deleted about 400 photos, but I cant get any more off my phone - everytime I start the copying process, the phone disconnects itself from the computer after one or two files!? This means that there's about 2GB of mp4 video on there that I can't delete in Gallery because it doesn't seem to exist there, and I can't delete by connecting USB storage because the connection stops whenever I try to do anything
This has me baffled...
It came from nowhere and I feel like I've tried everything. I turned it on using the safe mode thing (holding volume+, home and power), and rebooted it - but that had no effect. I removed about 12 apps to clear space. In settings, it says there is 1.15GB of free internal memory, so atleast the phone knows the internal memory is there. I'm not a tech genius and need some help. I don't want to do a factory reset because there's stuff on the internal memory that I do not want to lose (like the videos), but it's starting to look like the only option... Suggestions? Or explanations? Or anything really I'm so fed up with this
