ive read lords of threads and pages
still cant solve the problem
pls help

using multibit, i donated some btc to ags in january
now I want to claim my due bts
bitshares version 0.4.27.1, windows xp
the chain is syncnized todate
two accounts are created and registered

according to my study,
you can either import the file multibit.wallet
or export multibit wif key first, then import the key into bitshares
one will be enough. no need to do both
am i right?

so first, i tried "import keys from wallet"
i selected "multibit"
gave the full path:“C:/Documents and Settings/Administrator/Application Data/MultiBit/multibit.wallet”
input the multibit password
pressed "import wallet"
nothing happened
waited for a minute and tried again, nothing

so secondly,i tried "import wif key"
that went well
there was a message that the key is imported successfully
but the balance still zero
and then scanning started
waited for hours and it crashed for several times
had to start the program again and again
after the scanning was finally done
the balance still zero

then i went back to the first option,tried to "import the keys from wallet" again
i found no matter what i input, nothing would come out
i renamed some random file "multibit.wallet",and input some random letters as password
pressed "import wallet", nothing
no message or any response
so it's not whether the input is correct or not
this function is not working at all

then i thought maybe i should update the version to 0.4.27.2
so i was to backup the bitshares wallet
the program crashed again exporting a json file
restarted,"reset database",hours of downloading chain
tried another time,crashed again

====================================
here i am now
cant import my multibil.wallet
cant backup bitshares wallet
command "wallet_get_info" shows "scan_progress": "100.00 %"

pls advise:
1.is copying the entile directory "C:\Documents and Settings\Administrator\Application Data\BitShares\wallets" the same as exporting the json file?

2.input my btc address on www1.agsexplorer.com, i see i have some bts.
if my multibit wallet is imported successfully, does it go zero or remain the same?
mine isnt zero now

3.what can i do now to import the multibit wallet and get my bts?

4.is it common that the scanning went on for like 10 hours?