QUOTE(mastropizza @ 27.04.2009 10:48)

Hi,
we're not talking about "KAV client" but AK installation....i guess you have one master installation (and maybe a slave one)...if the DB is truly corrupted there's no way to make it working again therefore you have to perform an AK installation from the scratch.
That said, this is what KL Tech Support uses to suggest in order to try to fix the MSDE:
"...Fixing of MSDE database is not a simple action. The probability of successfull recovery is not big.
You should use microsoft tool ''osql''. You should use command line and add corresponding commands to file command.sql.
osql.exe -S <instance_name> -d KAV -E -i .\command.sql -o results.txt
Example 1. Sql server has instance KAV_CS_ADMIN_KIT and it is present on PC andkaz.
osql.exe -S ''andkaz\KAV_CS_ADMIN_KIT'' -d KAV -E -i .\command.sql -o results.txt
Example 2. SQL server is present on the same PC with Admin server without instance name.
osql.exe -S . -d KAV -E -i .\command.sql -o results.txt
Example 3. Admin server uses SQL server without instance name installed on PC andkaz.
osql.exe -S andkaz -d KAV -E -i .\command.sql -o results.txt
The commands for checking database is
EXEC sp_resetstatus 'KAV'
DBCC CHECKDB.
If you have backup copy of admin kit database the best way is to uninstall Admin Kit, uninstall MSDE, check and delete KAV.mdf file manually (if it is still present on disk) after uninstallation), install MSDE again, install Admin kit again, restore backup copy...".
Hope it helps
M
Tank you for your prompt replay
Actually the database is SQL express 2005 and I have a backup copy of admin kit database,Is there any problem if i uninstalled SQL express 2005 and install it again with adminkit and then restore backup copy