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I have re-installed PE7 a number of times without issue... with Audition you have two activations, if you uninstall you most deactivate it on your computer.
As for your crash problems... first step is to make sure to update your audio driver, video driver and Quicktime... in particular the audio and Quictime.
Well, I've solved it without re-installing but I'm surprised at what caused the trouble.
There was a faulty .avi file in the directory I've nominated for storing my source video and audio. (I'd started to transfer a large file, realised it was the wrong one and stopped the transfer before it was complete.) Deleting this one file has the programme working properly again. I mention it in case it helps anyone else in the future but I'm surprised something so basic could cause a crash.
Thanks for the advice that reinstalling isn't a problem...good to know just in case I ever have to.
Glad that you got it sorted out.
With crashes of an NLE, the most likely causes are:
1.) System - either hardware or other software and especially drivers, as Paul_LS mentions
2.) Assets - the Video, Audio and still images
3.) Project settings
The frequency of the causes of problems normally breaks down in about that order.
Thanks for reporting the good news,