Question : Operation aborted because SYS:SYSTEM\PRODUCTS.DAT could not be accessed

getting the above error in netware 5 please help asap....

Answer : Operation aborted because SYS:SYSTEM\PRODUCTS.DAT could not be accessed

Did you try all of the actions in the TID, or just the rename of PRODUCTS.DAT?  They mention some other Btrieve-related files, while I only suggested the rename of PRODUCTS.DAT.

The TID says:
>>
Flag the PRODUCTS.DAT, SHARFIL.DAT and BTRIEVE.TRN files as R/W or rename them and allow them to be recreated automatically

Delete the SYS:\SYSTEM\BTI.LCK lock file if you see MKDE.NLM allocating large amounts of memory on startup

Rename the PRODUCTS.DAT file.  Now go to NWConfig|Product Options|View/Configure/Remove installed Products.  This causes a new PRODUCTS.DAT to be created.  If you are not presented with an error then you know that the database was corrupted and you now have a new database to populate.
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Is that what you did, that didn't work?