Remote assistance from Mac to PC

Hey, my mother occasionally has issues with her PC and asks for my assistance. Before, I just used the Remote Assistance feature in MSN Messenger and fixed the issue using my Dell laptop. Now that I have made the FANTASTIC move to a MacBook, I am looking for a way to give my mother assistance, and it does not seem possible through Microsoft Messenger on Mac.

Is there a way I can remotely assist my mother, on her pc, from my MacBook.

P.S. She is in Iowa and I am in Minnesota, in case that makes a difference in your suggestions. Also, she is running Windows XP and I am running Snow Leopard.

Thanks!