Vqmods not working after upgrade

Hi

We are currently running V1.5.5.1 and have been trying to update to V1.5.6.4

When the files are transferred over and the install is complete the site runs but all of the vqmods which we are running no longer work and when I try to reinstall the vqmod's nothing happens?

What silly thing have I done?

Have you tried reinstalling vqmod by going to yoursite.com/vqmod/install

Failing that im sure ernie will be along soon as he seems to know the earlier version alot better than me

well, hard to guess, on no Facts and Figures, but I assume, VqMod was not re-installed correctly, as you mentioned.
And I always get a fever with a cold, when reading about upgrade or something like it...
must be a v-2 syndrome spilling over to 1.5...
Ernie