I have OFP installed on WinXP and have never had a problem. I did not have any problems with any operating systems except I believe WinME and that was actually a video problem. It amazes me that I hear so many people cannot get OFP to run with their windows OP system.
I really like the tracers. They add a lot of realism in my opinion. In a war there are tracers going off so how can it feel like one with no tracers. They should just improve them to make them more realistic.