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Windows timer inaccuracy!

I have an application which needs to sample a value every 60 seconds.  I use
the settimer function with an interval of 60000 to send a message to the
appropriate window which invokes the relevant member function to do the
sampling (I'm using Boralnd C++ 3.1 with OWL).  This all works fine except that
the sampling time actually creeps by about 1 second every thirty minutes.  I
store the time (obtained using standard C time.h functions from the PC clock)
in a file with every sample and after thirty minutes or so, the sampling occurs
one second later in the minute than originally.

I realise that the windows timer is only accurate to 18.2 ms, but surely the
settimer function is able to correct for non-multiple of 18.2 ms intervals
(obviously not!).  If not, then does any Guru out there know how I can correct
the time to accurately be able to sample every sixty seconds?

Thanks in advance,                         jav@itd.dsto.gov.au
Jon Vaughan
Information Technology Division
D.S.T.O.
Salisbury, South Australia 5108.