Unity overwrites old image effects and standard assets after system restore

Hi, I recently had to re-install windows because I had too much stuff that I hadn't used for 2 years. I backed up my project and put it on my other harddrive.

Now to the problem. When opening the exact same project on a clean-installed Unity 5.0.0f4, it seems that Unity overwrites my old image effects and standard assets. The first window that popped up when I opened the project was this: http://i.imgur.com/e4KlIR0.png

Whatever button I press then, I still get these errors: http://i.imgur.com/AmqqkSu.png

Note that I didn't use or had the "Utility scripts" before, so I just removed it. Then I got these: http://i.imgur.com/nb53bV8.png
http://i.imgur.com/0vxB2qA.png

Since I don't really want to screw up everything I've been working on, I am wondering if there is any way to just restore the project as it was before with the old image effects and and standard assets I was using?