go to newegg.com and log in. Click on my account, then on the left side click on Order History. When this pops up click on the show all button (or enter a specific date if you know when you purchased the laptop). If it is there then you got it from newegg.
This is probably easier then going through all the credit card info, as there will be significantly less of it.
i bought a 3 year warranty when i bought my computer ive cant find the info i dont know if i bought it from new egg or gateway how do i find out?
Well, you know I would simply call them and ask them, that is what I would do.
Either they won't have anything on file, or they will. Tada! Now was that so hard?