I went so far as to completely remove  BOINC, and deleted the BOINC
directory with the Seti stuff in it.  

I reinstalled BOINC 4.45 yesterday.  The computer downloaded Seti 4.18
and then was able to download the file names for 12 or 13 WUs, but it
was not able to download the contents.

With nothing running but 4.45 and it trying to download new WUs into
an empty cache the computer lost 5 minutes in just under 24 hours.
I just reinstalled 4.25 after removing 4.45, but not deleting the
directory of files.  So, starting at 6:16 local (2216Z) I'll let it
run for a couple of days to see if it eventually downloads any of the
files.  It's currently trying to download those files that are listed,
but has had no success to start, but as I recall  the one in the shop
was the same way.

As of last night the computer in the shop (running 4.45) appeared to
be back to normal as is the one in my wife's office.  

4.45 does not appear to run well on either computer in my den.  Both
run slow when the application is running but the other two do not.  I
am not running BOINC or Seti on this computer as it is already working
hard.  As I've mentioned before, this computer is a 64 Bit 3.4 Gig
Athlon with 2 Gig RAM while the other is a 3.2 Gig 32 Bit Athlon with
1 Gig of RAM.  None are overclocked. 

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com