Why would you colour correct in After Effects?
You have a great 3-way colour-corrector in Premiere, not to mention Reference Monitors and Video Scopes and for higher end grading you have Speedgrade
4GB of Ram is a little low for motion graphics and AE. Check your work area is not set to a small section. Playhead at start of Comp and press B, Playhead and end of comp and press N to reset it
I don't see an issue with using AE to color grade - although, Premiere has some great tools in that area and I'd encourage you to try them out! (And SpeedGrade, as mentioned.)
However, to deal with your AE issues, we need more info to help: FAQ: What information should I provide?
Version 220.127.116.11, recently updated
2.5 GHz Intel Core i5
4GB 1600 MHz ddr3
intel HD Graphics 4000 1024 MB
Anymore info needed ?
Wait, is 18.104.22.168 your AE version? Because that's not the latest version of CC 2014. The latest CC 2014 is 13.2
And, if you want the real latest AE, update to CC 2015 (but make sure you specify in the Creative Cloud software that you want to keep the old versions when you update!) keeping previous versions installed when installing CC 2015 applications | After Effects region of interest