If you restored from a June restore point then back to a point in the future you will get everything back that was installed, changed, etc. between the 2 points.
Stay away from using system restore while you have a HJT log posted!
Fix the problems in the log and then go on from there if the...
This might make it easier to find the right RAM.
Doesn't have to be Crucial RAM but it will tell you what specs will work for you.
Corsair is good and I use it as well.
Depends mostly what your interests in the field are.
For general info PC World is good. More indepth info on the technical aspects of this subject CPU would suffice.
For entertainment I like Phrack Magazine.