runtime error 91 object variable or with block variable not set while using accounts package

My operating system is windows 98 se.  I have an accounts package - Quickbooks for which I recently downloaded an update from the quickbooks website.  Since doing that I can no longer access some of the information - details on customers invoices.  I have a blank section where I used to have account details.  When I click on where the details should be showing I get the runtime error 91 message.    Can you tell me how to fix this.  I downloaded file mdac_typ which I thought would fix this but I still have the problem.  
I have also gotten the following messages:  2147418105 (80010007) Automation error and Runtime error 440 Automation error

Thank you
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run time errors are the result of poor programing, the error is in the program.
contact quicken and let them know, they should be able to help

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Runtime error 91 Object variable or with block variable no set Download: MDAC_TYPE 2.5 mdac_typ.ex
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