Excel Aborts in copy/paste macro

I've been having Office97 aborts when running a macro
which does copy/paste of large amounts of data. Microsoft
engineers said that cause is clipboard not clearing
memory. Fix was to rewrite macros using technology other
than copy/paste. P.s., adding memory was a suggestion
which didn't work. Below is a sample macro:

Call input_wks(destfilename, "idpmanex", "a1", "q:\finance\idp\idpmanex.xls", "idpmanex")

Sub input_wks(destbook, destsheet, destrange, sourcefile, sourcesheet)
Dim wb1 As Workbook, wb2 As Workbook, ws1 As Worksheet
Dim ws2 As Worksheet, rng1 As Range, rng2 As Range
Set wb1 = Workbooks(destbook)
Set ws1 = wb1.Worksheets(destsheet)
Set rng1 = ws1.Range(destrange)
rng1.Value = " "
Workbooks.Open FileName:=sourcefile
Set ws2 = ActiveSheet
Set wb2 = ActiveWorkbook
ws2.UsedRange.Select
Set rng2 = ws2.UsedRange
Set rng1 = rng1.Resize(rng2.Rows.Count, rng2.Columns.Count)
rng1.Value = rng2.Value
wb2.Close False
End Sub