I also suggest that you download and run Ccleaner from here and set it up with the options in the attached image and click on run cleaner.
Uninstall the video speedbit program. I also recommend to download and install a free virus program such as AVG, AVIRA, AVAST or Microsoft Security Essentials. Look in this thread for the programs and links to download them.
Did you have a drive G at one time? Sounds like you did and you installed your programs from it, so that means your uninstall log is now corrupted.
You can edit the registry so that you can uninstall everything correctly. Follow the instructions on this page.
http://kb.drivershq.com/KnowledgebaseArticle50060.aspx
I don't have the CD.Then if it was given to you, you don't really know what else is wrong with it. Providing you have reinstallation cd's, I would format and reinstall the operating system so that you know you are starting fresh.

lolThat's because you were in disk defragmenter, not disk mangement.
You need to reinstall windows since this system was given to you so that you know its a fresh install and no issues, which it seems you have plenty of.