Vista - Vista Generic Hardware Driver Issue

Hello,
I recently installed compact generic USB speakers which doesn't have any
drivers
CD etc.
Initially it installed and started working OK but now I have noticed that
after every reboot I have to go into Device Manager > Uninstall USB Compsite
Device & USB Audio Device > Then Scan for hardware changes > it finds the
drivers and installs. After doing that it starts to work again.
I found found something relating to the INFCACHE file permission in a
different post and have already tried it but has made no difference.

Can anyone advise how I can resolve this issue permanently?

Thanks in advance.
MM