[plt-scheme] 4.2.1 not running sqlite.plt?

hello,
I'm having problems using 4.2.1 to run jay mccarthy's sqlite module.
I'm using winxp.

Simply running:
#lang scheme
(require (planet "sqlite.ss" ("jaymccarthy" "sqlite.plt" 3 1)))
;; (3 1) through (3 8) lead to the same result:

. ..\..\Documents and Settings\<username>\Application Data\PLT
Scheme\planet\300\4.2.1\cache\jaymccarthy\sqlite.plt\3\8\sqlite.ss:12:3:
expand: unbound identifier in module in: ptr-ref

If I run:
#lang scheme
(require (planet "sqlite.ss" ("jaymccarthy" "sqlite.plt" 4 5)))
;; (4 0) through (4 5) lead to the same result:

ffi-obj: couldn't get "sqlite3_prepare_v2" from "libsqlite3.dll"
(The specified procedure could not be found.; errno=127)
reference to an identifier before its definition:
provide/contract-contract-id-sqlite3_open.5

If I uninstall DrScheme, wipe out the Application Data's PLT folder,
reinstall and again run
(require (planet "sqlite.ss" ("jaymccarthy" "sqlite.plt" 3 1)))
I get the following long readout:

require: unknown module: 'program
setup-plt: error: during Building docs for C:\Documents and
Settings\<username>\Application Data\PLT
Scheme\planet\300\4.2.1\cache\cce\scheme.plt\4\1\scribblings/main.scrbl
setup-plt:   require: unknown module: 'program
WARNING: collected information for key multiple times: (mod-path
"(planet schematics/sake)"); values: #(#<path:C:\Documents and
Settings\<username>\Application Data\PLT
Scheme\planet\300\4.2.1\cache\schematics\sake.plt\1\0\doc\sake\Build_files.html>
("Build files") #t (mod-path "(planet schematics/sake)"))
#(#<path:C:\Documents and Settings\<username>\Application Data\PLT
Scheme\planet\300\4.2.1\cache\schematics\sake.plt\1\0\doc\sake\The_Sake_API.html>
("The Sake API") #t (mod-path "(planet schematics/sake)"))
WARNING: collected information for key multiple times: (index-entry
(mod-path "(planet schematics/sake)")); values: (("(planet
schematics/sake)") (#(struct:sized-element ... ...))
#<module-path-index-desc>) (("(planet schematics/sake)")
(#(struct:sized-element ... ...)) #<module-path-index-desc>)
WARNING: collected information for key multiple times: (mod-path
"(planet schematics/sake)"); values: #(#<path:C:\Documents and
Settings\<username>\Application Data\PLT
Scheme\planet\300\4.2.1\cache\schematics\sake.plt\1\0\doc\sake\Build_files.html>
("Build files") #t (mod-path "(planet schematics/sake)"))
#(#<path:C:\Documents and Settings\<username>\Application Data\PLT
Scheme\planet\300\4.2.1\cache\schematics\sake.plt\1\0\doc\sake\The_Sake_API.html>
("The Sake API") #t (mod-path "(planet schematics/sake)"))
WARNING: collected information for key multiple times: (index-entry
(mod-path "(planet schematics/sake)")); values: (("(planet
schematics/sake)") (#(struct:sized-element ... ...))
#<module-path-index-desc>) (("(planet schematics/sake)")
(#(struct:sized-element ... ...)) #<module-path-index-desc>)
compile: unbound identifier in module
setup-plt: error: during making for
<planet>/jaymccarthy/sqlite.plt/3/8 (SQLite 3 FFI)
setup-plt:   compile: unbound identifier in module

(Note the references to version 3.8 of sqlite.plt)

If, on a completely clean system, I run
(require (planet "sqlite.ss" ("jaymccarthy" "sqlite.plt" 4 5)))
I get exactly the same result as above, except that the last 3 lines
are replaced by:

ffi-lib: couldn't open "libsqlite3.dll" (The specified module could
not be found.; errno=126)
reference to an identifier before its definition:
provide/contract-contract-id-sqlite3_open.5

My sqlite programs work normally if I go back to version 4.1.5.
Does anyone have any idea what's happening?
regards,
praimon