Alright TheCase, I'm going to start with some basic deduction here.
1. What version of Windows are you using?
2. You say randomly, but what type of programs are you trying to work with when these freezes occur (ex. Internet based apps, games, word processing, etc.)
3. You have stated that you have done "scans" what kind of scans have you done, using what scanners, and what if any were the results?
4. Have you checked your error logs? If not and if you need instruction on any of this let me know.
On a different topic related to your MIC. I believe that this has nothing to do with any forms of failure, you just simply have a sensitive pickup which will probably require some tweaking. At the very least try simply adjusting your input volume in the volume control window.