You didn't get a windows installation DVD? You need to call up the company that you bought your computer from and request one. In the mean time you can create a recovery dvd.
# In Control Panel, click System and Security (System and Security), and then click Backup and Restore (Backup and Restore).
# In the left pane, click Create a system recovery disk (Create a system recovery disc);
# Insert a blank CD in the DVD, and then click Create Disk (Create Disc).
Once the disk is created you can test it by attempting to boot from it.
You should also download a program like
Macrium Reflect Free Edition.
Once you've download that program, open it and choose the option to create a Boot Disk. When it asks you which system you want to use, choose linux instead of BartPe. Once the disk is created you can test it just like you tested the Recovery Disk.
Now that you have both a recovery disk and a boot disk from macrium, create a backup of your current C:\ partition on an external hard drive if you have one. If not, I think you can use disks?
You can also use Windows to do the backing up, but I've found that Windows backup tends to malfunction more often than not.