automaticlly

I Can't able to install XP SP2.windows always gives diff. diff. errors each time i try to install. my system reboots automaticlly. Is there any prob with RAM? :(

my sys-- pentium 4--256 ddr333---samsung syncmaster 593s---80 gb hdd my prob--- i had win xp.Now i installe fc3..everything went smooth...but the trouble is i need 1024x768--which works only with 256 colors---if i specify thousands of colors or millions the xserver stops and flashes back to...