1. The files beginning in K and Q are there in case you need to restore to the point your computer was at before installing that patch. If you remove them youwill not be able to revert back to that point. You can delete them but since you're not computer savvy, leave them there for a week or two after patching the machine and if you're not experiencing any problems, then remove them.
2. You can also delete the Dr Watson log. It is generated so a Microsoft technician can help diagnose a problem on your computer. I doubt you're about to call Microsoft if an application crashes and generates a Dr Watson.
3. When you see files in blue, it only means that they have been compressed to conserve space. Windows copresses files that aren't used very often when you run defrag. Hope this helps.