i use Dell inspiron 530 system with core 2 duo e4400 2 g hz processor.
and 1 GB ram. vista home premium OS.
now a days I face lot of problems during post boot up period(almost hang).
when I check RAM in- computer->system it shows 501 MB RAM.
This means one of the module has failled.
but sometimes it shows full RAM 1012(or 1013, i just cant recall correctly) and that time system runs fine.
I also disabled background intelligent services.
I am puzzled what's exactly problem is.
ps: these are original memories no new module added.