When you install a scanner - whether a stand-alone or as part of an all-in-one - normally the manufacturers distinguish in their software between the drivers and the other 'pretty' software. This seems to apply whether the software comes on a CD with the device or whether it is a download from their web-site.
You need the drivers to get the device to work, usually you don't need the other stuff bundled on the disc. That is not to say that this other software is useless or less then valuable - some people may find it very useful but installing it is an option you normally have. Or having installed it and then discovered that you don't need / want it you can always uninstall it.
As an example, I recently had to replace an Epson printer which went toes up. I never liked it with regard to printing photos, did a good job otherwise - text and documents - and I went back to my preferred brand, Canon. On the CD that came with it was something called 'Image garden' which was described as software for managing images and printing direct to CDs. Since I ship a lot of data around and my handwriting is, let's be kind, poor, printing lists of contents is important. Having tried it I found it just didn't do what I wanted so it was uninstalled. Since I still had the software from an earlier Canon I tried the CD print application from that, which I knew did what I wanted, and lo and behold, it works with my new printer.
Your original topic was in relation to OCR software bundled with a scanner. You do not need to use this software, you don't even need to install it unless you want to, if you have some form of OCR on your computer which you prefer. And if you buy a brand that works better for you you can always uninstall the bundled product.
I am open to correction on this because, since I do quite a lot of graphics work, I have mainly specialised software for working with graphics. Windows is somewhat limited when it comes to image processing. It does come with 'Paint', a basic raster graphics application and I don't think it comes with any form of OCR.