I downloaded and applied the 420 patch to a fresh installation of UT. Since D3D alway was too slow on my system, (at least 10 - 20 fps slower than OGL) I immediately switched to OpenGL just to see the game crashing back to W2k while starting UT. The afterwards enabled D3D works, how fast I didnīt check yet.
Anyone encountered similar problems?

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Celeron 300A @ 450
256 MB SD-RAM
40 GB HD
SB-Live! Value
3Com 905 TX
AVM Fritz! Classic
GeForce 256 DDR (Annihilator Pro, Det. 5.16)
Adaptec 2940 SCSI-2
Pioneer DVD-303 SCSI

So I upgraded to Detonator 5.17 and Powerstrip 2.67. Dunno what caused this, but D3D performance is much better since last time I tried. Itīs still far away from being perfect (=OpenGL ) but itīs finally playable.
It still stutters a little while flying around with the Redeemer.

BTW, does someone know where to get Detonator 5.22 for W2k?

Like I said before, OpenGL is still A LOT better than D3D. Just downgraded to Detonator 5.13 and started UT in OpenGL mode. Boy was that fast!