i just got 4gb of DDR2 ram, ATI Radeon HD 5750 video card and a OCZ 600 watt power supply and i plugged all of it in succesfully everything was looking fine and it turned on but everytime i now turn it on it shows this error message: "Warning system boot fail your system last boot fail or post interrupted" and it asks me to go into setup and load default and reboot again but im not sure what to do in the setup so im kinda lost there (and this error message pops up evertime i start my system) (also my old RAM was DDR 1gb) ..

My second problem is that when i get past this error message (i can press F1 to skip it) my computer comes to the login screen then instantly restarts but first shows a bubble in the bottom right hand corner of the screen saying something about me having to activate windows this is really annoying and i cant access my computer or log on to even change anything to make it not restart so if that question could be answered id be super thankful

merry christmas (or holidays)

~Oaks

Well first off DDR 2 RAM is 240 pin whereas DDR is 184 pin so you must have had DDR 2 in previously.

They are not interchangeable unless you replaced the motherboard.

Any major hardware change will prompt Windows to re activation mode.

Enter the BIOS setup and the option to load Defaults should be fairly obvious.

If the issue persists remove half of the RAM until you get things sorted.

Thanks for the reply ended up that the computer fixed itself somehow o.O i can log in now and its all good thanks though