Quickbooks 2006/07 Runtime Error - please help

I run Quickbooks 06/07 on Windows XP. It was working fine yesterday! Today, the error message !szFileBuffer.empty( )  appeared.  And then another error message:  Microsoft visual C++ Runtime Library   Runtime Error!   Program:C:\ProgramFiles\Intuit\Quickbooks\qbw32.exe   This application has requested the runtime to terminate in an unusual way etc    I found a similar problem and answer on this site (thanks guys) that said to uninstall and reinstall.  Did that but the same messages still appear.  Any other suggestions gratefully accepted - thanks.