BsPlayer 2.15 Skips Frames

[adytc]

Hello

Recently I've upgraded my computer and since then I've been experiencing the following issue:
I'm using BsPlayer 2.15 (build 943) and while playing a video file (doesn't matter what type), after a while the player begins to skip frames from time to time.
I have to mention that I'm using DivX 6.5.1, XviD 1.1.2 and AC3 Filter 1.11 codecs. I experience this issue with Windows Media Player and DivX Player too. Winamp and VLC Player are the only ones that don't behave that way (but I don't want to give up BsPlayer, as I'm very comfortable with its interface and features).
Is there a way I can solve this problem?
You can find in my signature my current system's configuration (before upgrading to this I had a Gigabyte GA-7VA Motherboard, GeForce FX 5200 Video Card and BsPlayer was working perfectly).

Thank you in advance.