Pheonix Darcy

I know nothing about computers so Can someone tell my if this PC would run SL smoothly AMD E1-1200 processor Windows 8 (64 bit) 4Gb DDR3 RAM 500Gb hard drive 21.5 inch monitor Includes keyboard and mouse USB 2.0, USB 3.0, HDMI Wi-Fi DVD-RW optical drive Acer Aspire XC desktop PC with monitor Thanks :)

I have had some problems when editing objects,clothes etc recently, when I right click on any object turns invisible therefore I can't see what I need to edit! After I end edit it returns visible! It was fine a week ago and now I don't know why its doing this! I use firestorm viewer(not recent update) can anyone help me sort this out, its really annoying when you need to build and can't see what you are doing.