My Samsung Admire keeps glitching up at the unlock screen need help?

It sounds like your Samsung has aquired a fatal system error which can be fixed by performing a hard reset.Unfortunately you will loose all data except for that on your removable SD card memory.
With this in mind (& it seams even without the error you appear to do this even if you forgot the pin/pattern/password etc), do the below.

1. Power off the phone.
2.Remove the battery for 10 plus seconds & replace.
3.Hold down the back arrow, volume down arrow & power key at the same time.
4.Using the volume controls, navigate through the menu that should appea to the Factory Reset.
5.Press the Home Key to confirm.
6.The Phone will now reset back to the factory settings as you first recieved it.

If you are clever reinstall your backup you made using Keis from your PC (& you will have beaten me!). If not, never mind & put your stuff back in manually ( like I would have too).
Once loaded, learn from this experience & make that backup!
Good luck!