I have only just got round to installing my copy of ZBrush 3.5, and I have now found the following problems:
(1) I get an annoying ‘WinTab services not available’ message whenever I start up ZBrush.
(2) Whenever I use any of the brushes, the render has lots of broken squares superimposed all over it. This just makes v 3.5 completely unusable.

Version 3.1 used to work OK on my PC, but since I have had to restore to a new hard disk, I have been unable to get it re-activated - so I am completely without a working version of ZBrush. 
It would be great if I could at least get v 3.1 working again.
Please could somebody help? Thanks.
My setup is as follows:
Armari workstation with Dual Intel Xeon 3.06 GHz processors.
4 Gb RAM
PNY/Nvidia Quadro FX 1100 graphics card with 128 Mb RAM
IWill DH800 motherboard.
Wacom Cintiq 18SX monitor/graphics tablet.
Windows XP Pro with latest updates applied.
Sun Java JVM with latest updates.
Latest Nvidia video drivers.
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