It sounds like the machine is a bad state. The error message isn't helpful, beyond pointing out that something fundamental (outside our sphere of control) is wrong.
First things first, if you haven't rebooted the comptuer since the problem started, that's a great place to start.
I would then recommend that you back up any critical data. If your hard disk is failing, it will often look like disc corruption before it dies completely. This is a great time to make sure that you're not going to lose anything important if it fails.
Once you have backups, the next step is to check the disk for problems, and repair them. This will create a lot of physical activity on the disk. If the disk is already dying, there's a chance that it might not survive. Again, make good backups first.
Once any errors are discovered and repaired, then you can try uninstalling relevant applications again. Hopefully that works. If it doesn't, then you're looking at resolving underlying Windows problems.
You can try the Windows System File Checker, which should validate that the OS is in a good state and allow you to repair issues: https://support.microsoft.com/en-us/help/929833/use-the-system-file-checker-tool-to-repair-missing-o...
At that point, you might try the uninstallers again. Hopefully they work. If not, then you should probably think about whether it might be easier to just format the machine and reinstall the OS and software. There are third-party system utilities that can try to help you clean things up, but a.) older windows machines perform way better with a fresh OS install (registry bloat, etc) and b.) there are no guarantees on the third-party tools, and you put a lot of faith into those tools to identify and recover from states that shouldn't really happen in the first place. I'm a big fan of regularly starting fresh, particularly on older windows versions.
Check your hard disk for errors - Windows 7:
https://support.microsoft.com/en-us/kb/2641432
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