This is a problem only you can solve. Go to CONTROL PANEL / ADD OR REMOVE PROGRAMS. Select the programs you do not want and start uninstalling them. Some of the names may seem a bit obscure and require some research. HP does install a lot of junkware.
DO NOT uninstall updates.
Reboot periodically and defrag the C: drive.
Go to http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?lc=en&cc=us&dlc=&product=1832426&lang
Order the correct Recovery Disk Set for your machine, it should cost less than $16. Do it now while thay are still available.
Now you can strip the D: Recovery Partition and use that space for data files.
You probably have a 4200 RPM hard drive. If the time comes when you need to do a recovery or just want more space, buy a larger, faster replacement drive. 7200 RPM is preferred. Installation is very easy - 6 screws.
Put your existing drive in an external USB case, they only cost about $10.
Your V5000T is an excellent machine and should give many years of productive use.