Deleted computer still appears in custom reports

Deleted computer still appears in custom reports

I use custom reports to get all computers with their installed Java / Flash / Adobe Reader version and install date.
In these custom reports a computer appears that does not exist for more than a year. This computer has been removed from active directory and does not appear in the Inventory view or in the All systems view of Patch Mgmt or in the SoM view. Neither it appears in pre-built reports like the "All computers" report.
But in existing custom reports and also when I create a new custom report - type 'computer' or 'software' does not matter - this computer still appears.
This is a problem for us because I cannot rely on the result of custom reports.
So, my question is how to get rid of such a 'zombie' computer?
And of course I wonder if this the only case of 'odd' data.
The simple solution would be to purge all data and re-scan all computers - we only have 140 computers, so this would be not the problem.
But what is the best way to do this? To create a new database?







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