|"Dell latitude and it came with Vista. Has a 16gb hard drive"|
It would help to know the model number of the Latitude. Is it possible the HDD is actually a SSD? That would make sense. Could it be a Latitude 2100 Netbook? The specsheet shows a 16GB SSD as one of the options:
"the computer is also infected with teryez and redirects chrome"
It's a browser hijacker. Relatively easy to remove & it's doubtful it has anything to do with your problems. But before you can remove it, you will have to uninstall some programs or delete some files so you have some breathing room to work with.
Download CCleaner Portable to a USB thumbdrive, unzip it, open the folder, double click on CCleaner.exe & then run the cleaner - remove everything it finds: