This is completely normal it's just the effects of certain drivers not running.

While in safe mode, your screen resolution may look a bit off, certain applications might not work properly, or your computer may run a bit slower than usual. Safe mode allows you to boot up your OS in a very basic state so you can potentially identify and fix the problem.

This could be due to any number of reasons, including a virus, malware, corrupt files, or something else entirely. Let's say one day you go to use your computer and find that your OS just won't start, or maybe it keeps crashing on you. However, when you start up in safe mode, only the minimum number of drivers needed to run the computer are loaded (usually just the mouse, keyboard, and display drivers). Normally, when you boot up your computer, it loads a lot of drivers, which are programs that allow your operating system (OS) to communicate with other devices and software.

Safe mode is an alternate way of starting up your computer so it's only using the essential programs needed to run. en/basic-computer-skills/how-to-defragment-your-hard-drive/content/ Starting a computer in safe mode Lesson 19: Starting a Computer in Safe Mode

Boot windows 7 in safe mode