Courtesy of MikeM.
Joan

psapi.dll is not a Win Me file although included as part of MS Office and
with
Win 2K/XP systems.

What applications or patches have you recently installed?  When did this
error
message first appear?  If not too long ago this might be an ideal time to
use
system restore to roll your system back to before this problem started.

I have a feeling that you might have a parasite or some sort on your PC and
if
you have not already done so I would also recommend you download yourself a
copy of the free Ad-Aware 6.0 from Lavasoft
(http://www.lavasoftusa.com/software/adaware/) and also SpyBot
(http://security.kolla.de/) and scan your system for and remove any unwanted
parasites, adware, spyware, foistware and any other junk that might be
hiding
on your PC.

Another user reporting a similar problem found that he also had a variant of
the CoolWebSearch parasite so it I would also suggest that you download and
use the CWShredder tool to remove it if present
(http://www.spywareinfo.com/~merijn/files/cwshredder.zip).  Unfortunately
neither AdAware or SpyBot seem to be able as yet to detect the CoolWebSearch
parasite as it keeps changing.  For more details of the CoolWebSearch
parasite
see http://www.spywareinfo.com/~merijn/cwschronicles.html.
--
Mike Maltby MS-MVP
mcmaltby@hotmail.com