If all you need is basic scanning functions, and I presume you have the scanner driver, then that is all you really need. If you use Photoshop, Word, or other major applications, you can scan into them as long as you have the TWAIN driver for the scanner. Irfan View will also accept scanned images.
If you need OCR, then you will need to look for a magazine cover disk version of Omni Page Pro or similar.
They don't come much lighter than that. The main installation file is just 817 Kbytes. The entire program directory with all the plug-ins is about 7 Mbytes.
You will be able to scan images with whatever settings are supported by the TWAIN driver, then use Irfan View to crop, resize, rotate, convert, etc.
However, if you want to do any retouching, you will need to open your photo-program. I have Corel Photopaint, but I rarely use it. At least 90% of the things I need to do with graphics can be done well in Irfan View. click here to see what it can do.