General Windows 7 Professional Help, Programs & Features Ect.

I have recently purchased a 'Dell Latitude D610' I bought it off ebay as it was fairly cheap and has windows 7 professional installed into it. The first week I have had it, I encountered problems with freeware It has seemed to automatically downloaded, now I have adverts popping up every were and my browser settings being changed with no control over what happens. I was advised to uninstall programs and thought that would be a good idea myself but when I went to do this it shows around 5 programs in the program and features section of the control panel and way over half of my installed programs are not showing up, I have tried everything and have been advised to restore windows but I do not have a disk to do this, I hope someone can help me with this issue.

Hi, thank you, There is a product key under my laptop I have noted it down, all I am worried about is that the laptop was refurbished and I think windows 7 was installed on it as the sticker on the laptop says designed for windows XP so I am worried that it isn't the right product code ?

I have contacted the owner of the buisness on ebay just now and he said he will send me a USB to re-install windows onto the laptop thank you everyone for your help.