So I took out memory from my Lenovo thinkcentre it used to have 8gb but I needed 4 out and I left the 4gb stock ram in the computer. Now when I boot it up I get 2 fast beeps then it says error 0164 memory size decrease. Then gives me f1 for setup (BIOS) and f2 for boot. How do I get rid of the 2 beeps and the error 0164 message? Putting 8gb back into the system is not an option here. Oh everytime I hit f2 it will load win 7 pro like normal but when I turn off the computer and turn it back on again, the same problem arises again. Any help is much appreciated.