THe disk I am saving to is full.....What does that mean?

May be you can try cleaning your temporary files,registry,cookies,etc. You can download C Cleaner or Be Clean which deletes all these kind of files which are of no use. Or you can delete temporary files by StartRuntemp/TEMP/%temp%/%TEMP% I am not sure if this would really solve your problem.One thing you can use is System Restore ,may be this would solve your problem.

try to do this go to safe mode first check the task manager on the process tab those are the most important processes that you have on your computer write that down then go to msconfig startup tab remove everything that you don't use except for your antivirus, then go to services tab hide all microsoft services remove the one's that your familiar with that you don't really use that much then restart your computer after doing this try saving some files if it still doesn't work try copying some files from a flash drive or some where else into your C:\name of folder\ if it works then your problem is within the ram if it doesn't work there's something wrong like the worm.addrive that I once had before or your hard drive is really full try deleting unnecessary files then try copying it again if it still doesn't work try saving it to other hard drives that you have I think there's a problem with your OS just send a message and I'll help you have a nice day