There are several programs that allow for Windows apps on Linux. Tarantella (now owned by Sun) makes some enterprise interoperability products, there is a program called Wine that allows windows apps to run on Linux.
Check it out here
One item of note is that it only works on X86 distros of UNIX, but it does work on BSD, Linux, and Solaris provided the hardware supports the X86 or X64 instruction set. So, no Sparc UNIX boxes can run Wine since it interfaces somewhat directly with the hardware at times just like many Windows apps do

And Sparc has a much more defined Hardware Abstraction Layer in place to keep apps from having too much juice.
Have you tried re-installing windows on the drive where SuSE was? Windows install boot program usually wipes the MBR and wipes out any Linux partition on the drive when you run it. If I have to reload the Windows partition on my laptop, I just go ahead and plan on rebuilding the Linux and Solaris Partitions as well. Those two play nice when they get installed, so they go on second, they actually recognize the Windows partition and create mount points for it so the data can be accessed even when one of the UNIX partitions is booted.