several issues - problems saving, exporting & erros messages

ISSUE 1

recently, when opening InDesign I receive this message:

"AIGPUSniffer Interface Binder has stopped working

A problem caused the program to stop working correctly. Please close the program"

This means nothing to me, possibly not an InDesign issue per se, but it only ever appears when I open InDesign, and it happens every time. (I click Close the Program, and it allows me to continue to InDesign)

ISSUE 2

when trying to save a new version of a document, I will receive an error message, along the lines of "cannot find the file" - but the file doesn't exist, I'm trying to create the file! I have seen other posts along these lines, to which the solution is to change the permissions - I am unable to change permissions on my (works) laptop - is this the only way around this issue?

ISSUE 3

possibly the same issue as issue 2 - but when trying to export to a PDF a very similar error message is recieved 

I have uninstalled InDesign and re-installed it every time I have encountered these issues - so far, up until this morning - this has worked and solved the issues (except issue 1), but this is time consuming, and not really practical - and it did not solve these issues this morning! Please help! Many thanks