PC running out of memory

[[TC] TAZxx]

Have you looked at something like Memtest for example? My experience with memtest has alwasys been pretty good, it methodically checks all of your RAM and will give you a full result.

ALSO, I would assume you don't leave your PC on all the the time and overnight etc... If you do, stop that. Although your RAM usage may be fine, but over time it's unable to allocate over. Only fix is to turn it off, and let the motherboard and RAM purge by leaving it off, so your RAM starts completely clean.