SL freezing before login

Hello, longtime resident of SL here with a problem.

(SHORT STORY)-Upon double clicking the SL icon and SL comes on screen the program INSTANTLY freezes and stops responding when the login screen is brought up, im unable to even input username+pass, i cannot even mouseover any of the buttons to try and change any of the preferences in case that helps. (!)-I have tried uninstalling, completly wiping my computer of all SL data, re-downloading the client from the website (version 1.12.0 (13) ) and re-installing, but the problem persists with no change.

(BACKGROUND STORY)-I've had SL running on my computer in fine condition but recently my computer was forced to undergo re-installing Windows XP onto it, at which time all my current data was still intact but everything became uninstalled, underwent re-installing all my drivers and reupdating my computer to how it was and it is mostly back to the original condition it was in. I use a Radeon 9700/9600 graphics card and have the latest quicktime installed as well. In addition all other programs i had on the computer that also had to be reinstalled all work without any trouble or differences in performance.

Im unsure if theres anything im possibly missing from my checklist so that SL will run properly or what i can do. Open to suggestions =\