Welcome to CF! That's great dedication to your country. 22 years. I don't think I ever would join the army. Unfortunately, Brazil's law is that at 18 you must enlist.
For your wife's laptop: You can do a couple of things.
If it's still slow you can:
- Run Virus/Spyware scan to make sure it's clean
- Defrag the HDD
- Buy more RAM
- And you could buy a 7200RPM HDD (assuming you currently have a 5400RPM)
I think there are programs out there that let you change the size of a current partition so you can create another. If that doesn't work you will have to delete the current partition, create two in place, and reformat.