Hmmmm... I just tried rendering with the quicktime output and it was fine but the file is way too big. I just need these for the web like 480P or something and its about 1.4 gigs. I think Ive been having trouble when I tried to render in a compresses format or something.
The default rendering format is lossless so the file size is appropriate. You need to read the help files on rendering and output. Choosing the right output format requires you to decide how and where you want to use the render. Lossless is perfect for further production but you may wish to use Adobe Media Encoder to render your lossless file to somethiong like the YouTube HD preset that you'll find there. You can also load your saved AE project into Media Encoder and render directly there. That's the best option for highly compressed formats you see on the web.
I just tried rendering with the quicktime output and it was fine but the file is way too big.
Read: http://forums.adobe.com/thread/684381?tstart=0 With regards to why it is crashing we would need more info about your exact output settings, multiprocessing settings and especially where you are saving. Since you are using an SSD, I get the distinct impression there is an issue with the media cache here and/or the temporary data generated for multipass encoding of compressed foirmats. Either the performance is rubbish to begin with or the drive is too small. therefore, as a minor make sure to set your Windows user temp folder and AE's cache folders to the platter drive, not the SSD.