So sorry I forgot everything about this
After downloading the update successfully when I went back to my own country, the lagging seems not to persist and most importantly the blue screen had not been showing up anymore.
Everything seems find although sometimes i still get some lags but it's no big deal and I am a high tolerance person so yeah
Also I seem to cant find the system and compressed memory service again, however not having a high physical memory problem seems to be more good than bad so Im happy with the out come.
At last thanks technician for helping me so much with the fast response and effective instructions.