My cousin had this problem it was spyware. Sadly the software I used to get rid of it was spyware doctor which is not free could try downloading a trial of it or webroot sweeper.Try Do STEP 4 to STEP 6 first If that doesnt fix it go to STEP 1 and proceed through the rest.
CLEANING COMPUTER OF TROJANS, SPYWARE AND VIRUSES
ALL THE FOLLOWING SOFTWARE IN THIS GUIDE IS FREE
STEP 1. First run online scans from the following (they may not clean your system but can give an idea of whats infecting you):
Panda online scan (doesnt remove viruses but can disinfect some threats do not click on the option to buy):
STEP 2. Once those are done Clear the system restore points (if you dont want to do this move onto the next step but be aware viruses can infect system restores and can come back or still cause problems):
Click Start >> Run - type SYSDM.CPL & press Enter
Select the System Restore Tab
Tick on the checkbox - "Turn off System Restore on all drives"
Then untick the same checkbox & click OK
This deletes ALL restore points that had the infection and creates a clean one
STEP 3.Run STEP 6 at this point then uninstall your virus scanner and install each one of these and run a full system scan. Make sure to uninstall each one after its finished and run them in safe mode (To get into safe mode reset the pc then keep pressing F8 until a menu appears in which you can select safe mode some computers use F5, F6 or F7 to get the menu up)
STEP 4. Proceed to try these spyware cleaners and rootkit finders again in safe mode and full system scans.
Ad aware SE:
Ad Aware VX2 add on (To run this tool once Adaware is updated click on Add-ons in the lefthand column. Select VX2 Cleaner V2.0 and click Run Tool. Click "OK"):
Advanced Spyware Remover:
Windows Defender Beta 2 (need real copy of windows to work)
CWshredder(removes some browser hijackers):
Blacklight (rootkit remover)
To clear the Java cache follow these steps (if java is installed):
1. From the Start button, click Settings > Control Panel
2. In the Control Panel, open the "Java Plug-in Control Panel"
3. Select the Cache Tab
4. Click the Clear button inside the Cache Tab, which will clear your JRE cache directory
STEP 6. Download this program to clean your temp files and registry:
SAFE GUARDING PC
To keep the pc safe to some extent it is wise to use some of the following software or anything similar to them:
Firewalls( only install and use one):
Spyware blaster (stops hijacking of your browser and blocks spyware):
Spyware guard (real time monitoring for suspicious behaviour):
Winpatrol (real time monitoring of registry changes and suspicious behaviour):
Avorax shield (real time monitoring for spyware):
Bazooka (scans for spyware if any is found directs you to a website on how to remove it):