Odd problem

I am not sure if this is a problem, but when I reinstalled Rome: Total War and Europa Barbarorum on my new computer, I started a game as Armenia and my armies and units were at half strength. For example, instead of my Hai Nizagamartik having 120 members, it had 60, and my slingers had only 30 instead of 60. Any idea how I can fix this?

This is "unit size" in the "video options" on the start menu. (Changing it only effects new campaigns.)

I always play on huge settings, seems more balanced that way to me.

Go into
Options - Video Settings - Unit Size and set it to Large

I must just say that I would recommend that (unless you have an uber-computer) you play on the current settings that you have now.