DDR-DRAM Upgarade Problems I have a Compaq Evo D310 with a motherbord ms -6541 ver 2.1 OS Win98se RAM memory is 128MB (DDR- 266mhz-cl2.5 PC2100u-25330). I wanted to upgrade the RAM to 512mb so I bought two new stick with 256MB of RAM each (DDR -PC2100).I put this two new RAM then my PC can not bootup at all, but when I replace with the old one everything wents fine. I have alredy tried a couple of things this include put one stick of 256MB insted of both 512 and this bootup the machine but stack when loading windows!!! I have change the setting by limit the amount of RAM to 120MB in MSconfig advance settings but still found problems. Disable system rom breakpoint,Disable Virtual HD IRQ, Force compatibility mode disk access all of this still the same thing!!! I have also tried to edit windows/system.ini file by adding the entry to Vcache "Maxfile cache=524288" but still problems. If the idea is to change the OS to win XP its OK but i am afraid if I might facing the same problems. Could any one advice of what I can do to upgrade this PC to 512MB? Please this is very argent and i dont know what to do next. I will really apriciate for your good responce as it can help a lot of people who facing the same problems. THANKS IN ADVANCE!!