The only solution I see is to reset/restore your laptop into factory mode or REINSTALL Windows.
There are so many ISO files of Windows just scattered around the web. Find one and download.
Then burn it into a blank CD using Daemon Tools. (You can watch tutorials on YouTube if you don't know how)
Or, if you don't want to do it, try these:
1. Download and Install an Anti-Virus software (I recommend ESET Smart Security 8.0.304)
2. Next, Download and Install CCLeaner (Watch some tutorials on YouTube on how to use it)
3. Scan your system with the Anti-Virus. Wait for it to finish. (It will automatically quarantine/delete all viruses scanned.)
4. After that, Open CCleaner and uninstall all unnecessary programs and files. Also, try to deactivate some programs that start during boot. (Like uTorrent for example)
5. RESTART
It worked for me and I hope yours too. My laptop lasted about 8 years until it was completely destroyed.
BUT, I still recommend that you restore your PC to factory mode. Just to be safe