Imac 2010 27inch endless problems in the last 24hrs

Hi guys, this is my first post and I am relatively new to the world of mac computers.
I have a 2010 27inch I3 imac. I installed 2 4GB ram sticks yesterday so it now has 12gb installed in total. Everything seemed fine after I installed them, checked to see if the imac was seeing them and yes it now says 12gb installed, was working fine and normal for about 30 mins, I clicked on paralles to see if my indows 7 would open, and then the problems started happening. It kept crashing, thinking something was wrong with windows or paralles, I tried to reinstall the mac os x again, this didn't go as planned, every time I tried to download the mac os it said try again later, instead I used the time machine to reinstall everything and the same issues keep occurring.
I have no idea what exactly the problem. Has this ram I installed done something terrible to my imac or is it something worse.
I am extremely frustrated. Please help

Hi, it wasn't crucial memory I bought and the only reason I didn't buy crucial was the iMac I have has Samsung sticks of ram so I purchased that brand. I have since taken the ram back out and everything seems to be working normal again.
I haven't updated the system to the latest software from apple as I have parallels 8 and it says I would have to spend another 80 euro to upgrade that for Yosemite to work with it hence I didn't upgrade but I don't understand why that might have an affect on how my system is running. I don't mind buying crucial ram but I am now fearful of buying any ram in case this becomes a continuing problem.
Since taking out the ram all my programs seem to be working and it hasn't crashed in the last 30 mins, which is a good sign but I am noticing that every minute or so maybe less, some of my folder icons and time machine icon periodically refresh or disappear for a few seconds and then return, I don't know why this is?

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