Lets try not to confuse the guy, here. Look do this... if you can, run system restore. Pick a restore point from an earlier time before your comp was messed up. After running system restore, download the anti-virus and anti-spyware programs I and Bahawolf have mentioned. Run a scan and it should detect any viruses or spyware that caused this weird thing to happen. And one last thing, dont try to short out on the process by not downloading the programs. If your problem is resolved by using system restore, you should still install the anti-virus/anti-spyware programs because the junk that messed up your computer may still be there on your computer. Good luck!