ASUS EEEPC4G IN USB ON WINXP... can i still use my LINUX? HOW? Please help me...?

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I hope somebody here could help me. Im really running out of energy to solve this...scenario:I wanted to install winXP in a USB on EeePC4G, so i get winXP installer, choose the 8GB USB as the path, winXP starts to copy files, then restarts and presto:NTLDR is missingpress any key to restartwithout surfing over the internet, i thought that its an easy installation. my mistake... having read the requirements, i realized that i need to copy and install first some important files, but how do i do it if i can no longer boot my linux???can i still retain my old linux? HOW? my thesis document files have no back ups, are they still in my documents linux? i really, really need some help, i dont know how to fix this...please send me a private message or email on how to fix this. im really running out of hope...thanks and more power.