You will need to uninstall the System Mechanic and forget about it altogether. I think System Mechanic as well as other programs related to it are a waste of time, effort as well as money and you will find that they usually result to a lot of problems than they solve. And there not much that system Mechanic does that you can't be able to do well with a little help from Google.
But if you insist on using System mechanic, then you should at least call their customer support and tell them whatever issue you are having so that they can help you fix it.
Hope your issue will solve after trying the aforementioned steps. I'd recommend you to go with CCleaner instead of system mechanic as this is a very rude software and always give you pop error messages over time.
One reason for that is when you tried to open a link listed in the “Problems” section of System Mechanic which will automatically open your default web browser. Now, if your default web browser is Microsoft Internet Explorer, expect that this problem will happen. Script errors are pretty common when using Microsoft Internet Explorer. It can be received in almost any website you visit.
To avoid getting this error, change your default web browser. For example, to make Chrome the default web browser, start Google Chrome then go to menu and select “Settings” or just enter without quotes “chrome://settings” in the address bar then hit Enter. In Settings, scroll down and look for the “Default browser” section. Under “Default browser” section, click “Make Google Chrome the default browser”.
And that’s it. Google Chrome is now the default web browser. Now, every time you open a link on your computer or within System Mechanic, the link will now be opened with Google Chrome instead of Microsoft Internet Explorer. You will no longer see those script errors that frequently appear when using Microsoft Internet Explorer.