Error after upgrade

[lchurchiii]

After applying the latest patch, when I try to execute a login I get the following message: Sugar CRM 4.2.1a Files May Only Be Used With A Sugar CRM 4.2.1 Database. How can I recover from this?

[lchurchiii]

Forum Disappointment - no responses or suggestions
I posted this a week ago, and for that week our system has been down. It appears the forum cannot really support users. Since this is a critical error that has hosed our system, it appears we need to reevaluate our options.

[drizendohs]

Why does it seem like no one reads the important posts for requesing help?
Here's a clue, you seem to have lost it.