Modules & VBA :: How To Loop Update Query On All Records Of A Table

I've set a database which has a table in which there are 2 fields "Account" and "Total Accounts". I want to have the amount of total summation of accounts in "Total Accounts" field of each record, which is the result of summation of "Account" values in all previous records till the current one. In order to do this purpose, I copied the value of "Amount" field of each record into "Total Accounts" field of the same record, at first. Then, I tried to add the amount of "Total Accounts" field of every record with just the amount of "Total Accounts" of previous one to earn the actual total amount of that record. I found that I need a VBA loop to do this query for all records (except first record) and so I code it as below, but it has the Run-time error '424' : Object required and it seems that I am in a mistake in definition of strSQL variable:

Code:
Private Sub doDataSegm_Click()
Dim dbs As DAO.Database
Dim rs As DAO.Recordset
Dim strSQL As String
Set dbs = CurrentDb()
Set rs = dbs.OpenRecordset("Table1", dbOpenTable)

[Code] .....