MN-500 and MN-510 adapter - loses connection at reboot

I've looked at various topics but can't find one that
specifically helps my situation.

I've got Win XP Home with Svc Pack 1 update. I'm using
the MN-500 base station, and the MN-510 USB adapter to
connect with my DSL modem.

I enabled 64-bit security, because I don't want to have
no security. However every time I reboot it won't
recognize my adapter, and I have to manually reconfigure.

Can anybody provide any guidance here.

Thx - M