Although you deleted the Linux partition this will not allow you to expand C: using XP.
Under Disk Management you should be able to format that 2nd partition and use it.
Disk Management = Right click My Computer then click Manage then Disk Management.
You should see a section labeled Unallocated space. This is the partition you deleted. Right click Unallocated space and choose format and this will reactivate a new (blank) partition.
If your desire is to expand C: you will need either partitioning software or you will need to reinstall XP.
Here are perhaps the two most popular softwares:
http://www.acronis.com/homecomputing...titioning.html
http://www.symantec.com/home_homeoff...d=sp&pvid=pm80