Personally, I never really install support assists on systems. However, I do always install Dell command update or Dell update.

SupportAssist is a free tool that Dell installs on PCs to help keep them up-to-date, but it isn't essential. You can always go to the Support page for your specific model and look for updated drivers etc, based on the version numbers (not the dates) when compared to the drivers currently installed on the system. Lots of users have been reporting issues with Dell's SupportAssist after some of the recent Microsoft updates. Dell has suggested uninstalling SupportAssist in Windows and then rebooting. Then download the latest version of SA and install the new one. Keep in mind that Dell doesn't support Win 10 on the Inspiron 2020 (Only Win 7, 64-bit)) so that might be part of the problem @Tinymorsel is having. But Win 10 is supported on the 3668 so try uninstalling/reinstalling the app and see if that helps.

I used support assist for long and stop using it. I don’t know that this app does but it seems that there is a bunch of bulls*it because it is very slow and changed the behavior of the laptop(some bug appeared after installing support assist). In addition, most of drivers update are broadcast through windows update nowadays.

Based on your comment, I re-installed Dell Update and within a day got a notice to install a driver that is not even listed for my 5759's service tag although it is listed for generic 5759 systems (http://downloads.dell.com/published/pages/inspiron-17-5759-laptop.html) which covers all variants of 5759's ever produced. SupportAssist says I am fully up to date. I contacted Dell support and had a very frustrating session with some guy who basically just wanted to close a ticket and get back to his nap.  Understandable given that they are 12 hours out synch with us. His points:   - don't install anything if you are not having problems (yet DELL tools and web site can state an update is recommended or urgent)   - don't install anything that Support Assist does not recommend (so why have DU?)   - keep DU because it installs drivers (so does SA including BIOS)   - keep DU because it installs drivers that are generic whereas SA does drivers that are specific to my configuration (nonsense - there are dozens of generic drivers that are not applicable to my system so why would DU want to download them and install them)   - don't install a driver if SA does not say you need it (apparently he does not read what he writes....)   - etc... more of the same ... DELL refuses to fix either SA or DU or resolve conflicts between the two or even to acknowledge that there are problems. I happened to notice I was missing a driver that the web site indicated was urgent post Win10-1803. Neither SA nor DU picked it up. When I first started buying Dell systems, I ignored the tools and checked the web site directly.  Then for a while DU was generally useful.  The SA came out and was ok.  Now both are questionable and buggy in many ways (installation conflicts, broken functionality (missing updates, incorrect wrt warranty status,...)) so I am going back to depending on checking the web site manually and using SA as a quick check in case it detects something I miss.  I am uninstalling DU - it seems to be dangerous.  At least SA will not install anything on its own as far I know. Dell tech support is a shadow of what it was a few years ago.  I discovered an issue with a couple of 5770's I was setting up for non-technical friends.  Others had hit it as well and it seems to apply to all 5770's but it took over a month for Dell to even acknowledge there was an issue (20-30 system event messages per second when using wifi) and I was then told by a tech support supervisor that since wifi was working that DELL did not care about the problem - he was blunt - if the boot up diagnostics don't fail then he did not want to talk to me.  I contacted a product manager in the US I had met through these forums a few years ago and he took over the issue and it is now being pursued by component manufacturers (either qualcomm or rivet networks I suspect).  This guy is great but he should not have had to get involved. Lenovo is looking increasingly appealing from a price perspective - no experience with their support - I had thinkpads in IBM days and tech supt was great.

Just uninstall it. You do not need it.

Just more bloatware DELL and HP puts on PC's

1. Beware the term "optimization." It is used by software products in an effort to sell products that at best do nothing, and sometimes have disastrous results. No optimization is needed.
2. I recommend avoiding the use of Dell SupportAssist
3. Drivers should always be download from the web site of the manufacturer of the hardware the driver is for--not gotten anywhere else.
4. Forget about that Dell SupportAssist does. None of it is needed.
5. Yes. For example,download, install and run Firefox (my personal favorite browser). It will ask you to make it your default.