I'm running 10.6.6, recently updated. Yesterday, I installed Logic Pro 9, and it didn't seem to finish properly the first time, since I had accidentally asked to install extra content that I didn't have disks for. So, I installed it again. Right after trying to run it, I started getting full system crashes and the pinwheel. So, I decided to restore to a Time Machine backup I had done a few days earlier, hoping that I would just "start" fresh. Without realizing it, I had inserted the Leopard install dvd that came with my computer, and restored to my 10.6.6 backup. I got the "You must restart your computer" error, which I found out was a result of using the Leopard disk. So, I redid the restore using a Snow Leopard installer on USB. After this, everything appeared to be working fairly well. However, today, I've started to get system crashes quite frequently, and at times I haven't been able to properly shut down or restart. I noticed that Spotlight was indexing, and would hang at "3 hours remaining" or "estimating time left." Right now, I have created a second admin account, and I have disabled indexing. It seems to be working, at least temporarily, because I'm using it right now. I have tried repairing disk, repairing disk permissions, using DiskWarrior and Applejack (on AUTO setting). None of these seem to have fixed the crashes I have been getting on my main admin account. Any thoughts?