You may not be out of luck. Check the following KB article and see if there may be light at the end of the tunnel... :-)
How to assign a private key to a new certificate after you use the Certificates snap-in to delete the original certificate in Internet Information Services
http://support.microsoft.c
Dave Dietz
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by: RubalJPosted on 2008-02-28 at 22:23:19ID: 21011317
Did you just delete the certreq.txt file or the certificate request from IIS also ?
If you just deleted the text file then you can still install the SSL on the domain for which csr was created.and If you deleted the site then you'll need to recreate it andwill have to generate CSR again and will have to get the SSL reissued.