dpinst on Vista w/o administrator rights

Hi,

I’ve encountered the following problem when attempting to run dpinst
(version 2.1.0.0) on Vista
systems (both32 and 64 bit) w/o administrator privileges:

The hourglass-circle flashes, task manager shows multiple instances of the
dpinst process, and memory utilization is high.
After approx 10 minutes (actually on 64 bits only reboot helped, after ~30
minutes), the processes disappear and
all returns to normal. DPInst.log isn’t created, driver isn’t installed,
and no error message is shown - which poses a
problem for us since this behavior isn’t acceptable by our customers.

In XP, the same dpinst.exe presents an appropriate error dialog saying
user does not have the correct privileges.

Thanks,
Galit

===========================================================================================
The privileged confidential information contained in this email is intended for use only by the addressees as indicated by the original sender of this email. If you are not the addressee indicated in this email or are not responsible for delivery of the email to such a person, please kindly reply to the sender indicating this fact and delete all copies of it from your computer and network server immediately. Your cooperation is highly appreciated. It is advised that any unauthorized use of confidential information of Winbond is strictly prohibited; and any information in this email irrelevant to the official business of Winbond shall be deemed as neither given nor endorsed by Winbond.

My questions regarding the above post are:
Is this a known issue ?
Is there any workaround (e.g. some dpinst flag or .xml element) ?

Thanks,
Galit