Hello, I am a newcomer to this forum and thank you for welcoming me. I apologize for my deficiencies in English, I am French! ! But I hope I will understand .... My question is this, I have a PC HP Pavilion a1617.fr It is equipped with a motherboard RC410-M with 2x512MB RAM. This computer allows there a trend towards 2x1024Mb.?.? I ask questions because after I installed 2x1024, I get an error message at each startup saying that the fault is caused by the newly installed hardware! Is there possible to correct this problem, are there risks? Should I resign myself to stay in 2x512?? I thank the entire community for its assistance Regards to all.