Voice dictation - Viavoice Excel - any help appreciated

I'm using ViaVoice for Windows Pro USB vn 9 with Windows XP and it's Ok most of the time if I'm dictating from written notes. Now that I've got a whole stream of assignment scores to input for some of my students, I've tried dictating them directly into Excel but it's pretty damn frustrating. Seems to stick on certain cells and refuses to input the values that it's clearly recognised. Then in the middle of string of identical numbers (4's actually) it decides one of them's going to be text.
So after taking twice the time it would have taken me to enter them by keyboard, I do a bit of googling to see if there's help anywhere at hand. Various bits of advice later, I'm dictating to Speakpad with dictated commas between numbers - e.g. 4 comma 4 comma 3 comma ...
This seems a bit crazy to me. I import the comma delimited file into Excel and it does what it says on the tin - but what a waste of time. Viavoice clearly recognises the numbers (despite my Irish accent!) that I'm saying. Why on earth can it not process then correctly into adjacent cells in Excel.
If you've already cracked this one, get in touch. I've still got quite a few more marks to input!