ROM Update Problem

[MX51]

Alright well I made a stupid mistake. Now I don't know how to fix it...

I was trying to update my Touch just to see if the ROM would make it a little faster or if it would help at all. I left the phone and computer running doing the update. Then after about 7 minutes I come back and my phone is only showing the red, green, blue and white lines on it. I cannot go anywhere from here and have been trying to fix this for a while. I tried re-running the update process to see if it would install on my phone but no luck. Now I am stuck with those colored lines and can't use my phone at all. How do I go back to my old settings? I can't live w/o my Touch!