Once Windows loads, hit F1. On the right side of the help screen, there's a link to System Restore. You can then restore your registry to an earlier (good) configuration.

1999 Red / Tan SVT #1969 of 2760 Built 4/21/99 K&N, DMD, FMS Wires, ES Insert / Bushings, PF End Links 17" FSVT 5-Spokes Factory Spoiler 35% Tint All Around