There is one basic premise you should keep in mind. If you say No to something you should have said Yes to, the results may be fairly dramatic and it may cause some of your software to cease funtioning.
If you say Yes to something you should have said No to, the results will be no different (no worse) to what would have happened if Teatimer had not been present.
You will considereably reduce your problems if you manually turn off Teatimer
(Advanced mode/Tools/Resident/Untick the Teatimer box) before you do any significant installation of new software. Don't turn it back on until the software has completed its installation, and you have rebooted the computer