vba excel 2000 device i/o error
 

I am facing two problems presently. First is the
error "Device I/O error" when I try to open object view
on userform from Visual Basic Window. Second is even if I
have closed the excel worksheet, the project explorer in
visual basic still shows the sheets, forms, modules of
the closed workbooks. Also whenever I try to open a
workbook all the downloaded previous pop up with warning
messsages before finally openly the intended workbook.
Has anyone got any suggestions ?