I guess u installed with automatic partition mode ! NEVER DO THAT! Next time install with manual partition! DOnt worry about ur data. Its gone! It may be recovered, but chance will be dim!
If u r new to linux, then I suggest to install with manual mode first on a blank hdd! Recognise the partitions u created then!
hda = primary master
hda1 = first partition
hda2 = second partiton and so on!
/ = root partition
If u create partitions well with suse on blank hdd, then only I suggest u to install windows after that ! But installing windows, then linux is better. But u may mess ur windows again! So....
Suppose u got 80 GB hdd, then I suggest that during manual partition mode give
1st partition = 30 GB (Xp,fat32)
2nd = 40 GB (Suse Root partition, ext3 or whateva is default)
3rd = 1 GB (Swap, if u use Oracle etc or else 500 Mb wud be enough)
4th = Remaining GB (Fat32, that can be shared bet windows and linux and used to put songs etc)!
If all goes well Install Xp, u'll urself will recognise Xp 30 Gb partition and install Xp on it! Suse Grub will be lost then, no worry! Install first SUSE CD, enter in repair mode and repair grub)!
At grub prompt type
1. root(hd0,1) i.e primary master,2nd partition(Suse)
2. setup(hd0)
3. Quit
Finally u'll have Xp+Suse installed in place!