Tarrow

If you mean updating your Dayz Mod server (current version being 1.8.0.3 I think) then you need to either speak to your server provider or update the server yourself (depending on how it's being hosted). If it's your dayz mod client that's on 1.65 (so not matching server version) then easiest update is via dayz commander. Either way you may get more support by posting in the dayz mod support forum, not the standalone server support section. Dayz SA is on version 0.43.116251.

Quite right. O+ is a good blood type to have if you're donating, lousy for receiving. I wonder which countries blood type distribution has been used for Standalone? There're marked differences in distribution by geographic region (or more accurately by ethnicity). For example O negative (THE universal donor) occurs in 0.2% of the population in some counties and up to 9% in others. AB- varies from as low as 0.03% to 1%. Across most of europe the most commonly occuring blood type is A+.

GPU is likely to be an issue. Even though the 9300M is a more recent configuration than the (Arma2 minimum spec) Geforce 7800 it is significantly less powerful.

The geforce 520 will be the limiting point there, it's not a gaming GPU it's the £20 card they make for office computers that don't have on-mobo graphics. GeForce 520 performance specifications are below that of the geforce 7800 that's listed as the minimum requirement for Arma2.

It sound counterintuitive but try turning your detail levels up a bit. Try normal, but leave the AA, ATOC and PPAA disabled and see if that gets you any improvement. The engine has this trait of throwing more of the graphics processing to the CPU on the lowest settings. I'm running a significantly less capable rig than you and my framerate is pretty consistent even with excessive numbers of z's around.