This morning, while I was running a local DNN site, my computer crashed, and after I rebooted, DNN 4.4.1 won't run any more.
Now whenever I try to access a site, DNN says

DotNetNuke Upgrade Error
The Assembly Version ( [ASSEMBLYVERSION] ) does not match the Database Version ( [DATABASEVERSION] )

ERROR: Could not connect to database.

Cannot open user default database. Login failed. Login failed for user 'REX\ASPNET'.

(This is all locally, through localhost/sitename. No network-wide side effects, fortunately.)
But what can I do to solve this? I could try reinstalling DNN, but I'm afraid I'd lose all contents.

I read in another thread about restarting the IIS, but that doesn't help. Neither does switching the computer off and back on.

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Groetjes, Pim

Thanks for your reply.
I already got it running again after reassigning ASPNET access to the directory that the database is in. I had to do that before, the first time I installed DNN, but I'm not sure how it got changed now.

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Groetjes, Pim