New answers tagged installation
In order to fix corruption of the projection database, as I had in this case, copy srs.db from an unaffected installation. This is the database where all projections are stored. On Linux, this can be found under /usr/share/qgis/resources. On windows, this will be under Osgeo4w/apps/qgis/resources. It doesn't matter if the unaffected computer is windows ...
I actually solved it myself. I republished all my map services which took care of the issue.
It sounds like your computer may be infected with a virus unrelated to QGIS. "123.exe" Is listed on many virus forums as a key logger. Clean your computer and then re-install QGIS. QGIS itself is clean and safe so you acquired the virus from some other source.
Had the same problem a while ago. The answers explain the installation pretty well! http://askubuntu.com/questions/351899/qgis-quantum-gis-install-fails-unmet-dependencies
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