WDSC V6 and Code Designer

Hi All, 

I was running WDSC, including CODE designer, v 5.1.2 quite successfully. 
In order to upgrade to v6 I uninstalled the previous version, loaded WDSC 
and then CODE and VARPG from the supplied CDs. WDSC is still fine, but I 
can't open any dspf's in CODE designer. I select the Open With... from the 
member list, CODE launches, attempts to retrieve the DDS and then presents 
an error window saying...

RegQueryValueEx: No error text is available

All I can do from there is click ignore. I've also tried starting CODE 
independently outside of WDSC but I get the same error. I have no problems 
opening the same DDS in LPEX or CODE editor. 

I've tried un/reinstalling CODE to no avail, can anyone suggest anything 
else before I give up and do the same with WDSC???

Thanks, Cheryl.