You may have some hardware issues that may not be Access?

Second, are there any virus,trojans,spywares?

Scan the harddisk for errors, if possible scan the RAM memory modules for
error with memtest utillities. They are avialable free from the internet
sites.

Mark Liquorman wrote:
I found that using a switchboard just opening and closing forms increases the
size.

Let me repeat. This bloating occurs in an empty database! No objects at
all. No tables, no queries, no forms, no reports, no modules.

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