Presario V5000 -- Junk from BEST BUY

Bought a laptop, got the show computer since they were out of stock. Geek Squad promised to remove all Best Buy stuff ... wipe there stuff out like it had never been there. Got it home, found all kinds of Best Buy stuff but didn't affect functionality, had plenty of space, didn't bother taking it back. REGRET!!! Fast forward two years ... I NEED THE SPACE!!! Don't know what to do. Don't know what I can wipe out & what I need for the computer to work. Can't take it back to store & don't want to pay someone to do something this simple. Please help!! What can I do to get all this stuff off? What exactly do I NEED to keep the computer working??

<<If this is a repeat, I apologize ... when I created a username, I got a blank message page again & didn't know if the first one had gone through or not>>


Thanks,
Colleen