Why do you think somebody is controlling your PC?
Try this:
Firstly, boot your computer to the Safe Mode menu screen. You do this by repeatedly pressing F8 as soon as you boot up. Once there, use the arrow keys to highlight Safe Mode with Networking. Continue to boot from there.
If that's successful, download and run TDSSKiller.exe from Kaspersky Lab. It's tiny, and takes just a minute to run. It hunts down and kills a specific family of rootkits. Here's a link:
http://support.kaspersky.com/faq/?qid=208280684
Regardless of the results, download the free version of Malwarebytes' Anti-Malware. Install it, get updates and run a full scan (still in Safe Mode). Here's a link:
http://www.filehippo.com/download_malwarebytes_anti_malware/
After that, boot normally and run another full scan with MBAM. It will detect any malware that wasn’t running in Safe Mode.
TDSSKiller.exe can be deleted, and Malwarebytes' Anti-Malware can be easily uninstalled, should you wish to do so.
Hope this helps.