Installed a ROM and stuck in Bootloop mode on Nexus S

[mnkr]

Hi peeps,

I need help,

I have a Google Nexus S.

So I installed crespo stable onto my phone and gapps as well. I must've installed the ROM and Gapps that weren't compatible
Now my phone is stuck at the Google loading page (the one with the unlock sign).

I have downloaded the Android ADB SDK bundle. I have watched other tutorials of how to adb sideload files, and when I go to cmd C:\androidadk\tools> "abd devices" my device does not show up. It just says list of devices attached. Is there something I am doing wrong, or is there another way to get out of bootloop mode?