That's very strange, I have a machine that matches closely yours:
Pentium 4 2.26
768MB
FX 5200
Windows XP
Expandable with everything enabled and maxxed out at 1280x1024 get 35FPS with Fraps
Incoming with everything enabled and maxxed out at 640x480 (can't set higher res) 28FPS with Fraps
I'm using the last XP driver (125.something), maybe it's something related to your motherboard, because the drivers you've used are more compatible with older games.
P.S.: I've used the demo versions of these two games.
DT: R7-5800X3D/R5-3600/R3-1200/P-G5400/FX-6100/i3-3225/P-8400/D-900/K6-2_550
LT: C-N2840/A64-TK57/N2600/N455/N270/C-ULV353/PM-1.7/P4-2.6/P133
TC: Esther-1000/Esther-400/Vortex86-366
Others: Drean C64c/Czerweny Spectrum 48k/Talent MSX DPC200/M512K/MP475