RDP works from one PC but not another

[Aarowm]

I have a laptop running Windows 7 32-bit and can RDP into my work computer with no issues. I just built a new desktop with Windows 7 Ultimate 64-bit. With my new desktop I can not get into my work PC. We have a SonicWall VPN connection. I can log into the VPN and can ping my work PC with my desktop. I was able to connect once but only rendered half my screen then disconnected. Every time I try to connect it times out. My work PC is running Windows XP Pro 32-bit. All Windows firewalls are turned off.

I built the desktop so I could stop using the laptop to remote into work. I'm still stuck having to use the laptop. Please help!