|"... and the details regarding your laptop are?"|
In other words, what are the make and model (usually on the bottom of the laptop case).
Most laptops these days have an option to reset the machine to factory defaults (you will probably lose all your saved files and installed programs). You should be able to access this option during the boot-up process (before Windows begins to load). Before using this option, follow these instructions to save your files (including any photos, music, etc).
Download one of the (free) Linux live (there are a few available, but any will do) image files (.ISO) and burn to CD/DVD media. Set your laptop to boot from CD/DVD (setting is in the BIOS) and boot from the Linux live disk. You should now have access to all your personal files, giving you the opportunity to back-up these files to an external (USB) drive.
Once your files are backed-up, remove the Linux live disk and reboot, selecting the factory reset option. When the process is complete, Download and use "PC Decrapifier" to remove all the factory installed trial version programs (usually anti-virus, at the very least). Now it's time to install your third-party programs, beginning with a good anti-virus (there are free ones available, e.g. AVG).
If you post back with your laptop details, we can provide more detailed instructions, if needed.
Please let us know if you found someone's advice to be helpful.