Hi, thanks for all the addvice given. None worked, however.
I followed your link and arrived at this description for the update:
"Update 935509 contains an update that you must have to correctly
service Windows BitLocker Drive Encryption-capable computers. This
update is applicable to only the following editions of Windows Vista
that include Windows BitLocker Drive Encryption: •Windows Vista
Enterprise •Windows Vista Ultimate"
However, as I run Windows Vista Home Premium 32-bit, it doesn't seem to
apply to my system. Can anybody tell me why Windows Update keeps nagging
me to install it, when it will not install? Is there a way of getting
rid of the update reminder (except hiding it, which I have already
done)? Or if it needs to be installed after all, how to get it onto my
machine?
Thanks again.