Yes sure. I will explain you how to customize your HP desktop,
Installing additional memory (RAM) gives you the ability to accommodate more complex applications at one time, switch between them instantly and make them run more efficiently.
How much RAM is enough? 512MB of memory is standard for everyday needs like school work and research, home finances and projects, and downloading photos and video. But in order to handle new, larger and more complex applications for video editing, higher end graphics, etc., it may be worth considering installing 1GB of memory.
The same goes for hard drives. Consider a hard drive with more capacity than the standard 40GB or 80GB to leave yourself room to safely store all your future documents, music, photos and other files like family finances.
Also consider purchasing a secondary CD/DVD drive. Choose a CD-R or CD-RW, DVD-R or RW, or combo drive so you can easily burn your favorite music or movies on one drive, while saving your documents and other important files to a CD or DVD on the other.
If you plan on creating and burning a lot of music CDs, video DVDs or both, another drive to consider is LightScribe. With LightScribe Direct Disc Labeling Technology, you can record music and movies onto LightScribe-enabled CDs/DVDs, and print personalized, silks-screen-quality grayscale labels featuring photos, montages, original graphics and text directly onto the disc, all with the very same drive.
Hope this helps. And visit the link i have mentioned in my source for much(more) information about customizing a new hp. They have mentioned the steps you have to take and etc.
Good Luck !!