postgresql, r and windows

Dear R-DB users,

I have  a problem in accessing postgresql from r.
I can only use library(RDOBC), because the drivers for postgresql (RdbiPgSQL)
from DBI are not available in windows (does anyone has tham?), so, using th ODBC...

library(RDOBC)

chanel1=odbcDriverConnect("DRIVER=PostgreSQL; DBQ=campanhas") # it connects
sqlTables(chanel1, "tbl_taxon")

TABLE_QUALIFIER        TABLE_OWNER                      TABLE_NAME TABLE_TYPE
1             <NA>            cripsul                           prova      TABLE
2             <NA>            cripsul                       tbl_biolo      TABLE
3             <NA>            cripsul                       tbl_dredg      TABLE
(...)

sqlColumns(chanel1, "tbl_taxon")

[1] TABLE_QUALIFIER   TABLE_OWNER       TABLE_NAME        COLUMN_NAME      
 [5] DATA_TYPE         TYPE_NAME         PRECISION         LENGTH           
 [9] SCALE             RADIX             NULLABLE          REMARKS          
<0 rows> (or 0-length row.names)

sqlFetch(chanel1, sqtable="tbl_taxon") ## nao funciona

[1] "[RODBC] ERROR: Could not SQLExecDirect"               
[2] "S1000 7 ERROR:  relation \"tbl_taxon\" does not exist"

So, it does not access the data, although it knows that the table is there!!!
However, it does the connection with access or excell well


Thank you very much in advance,
Any light will be strongly apretiates,
Best wishes,
Marta

PS: I am working on a windows XP professional and R 2.1, postgresql 8.0.