When i updated OS X update to 10. 10.2 and iTunes to 12.1 and restarted my mac, safari got messed up

Question

I updated my OS X and iTunes today and when I restarted my mac, safari got messed up. No matter how many times I change the preference of the new windows and tabs to favorites and remove the homepage site, it always get back to what it was-- homepage for both and search-quick.com for the homepage site. I can't open a new tab/window with the favorite--and it's very annoying since it opens with the search-quick.com. I've never installed search quick program, and I can't get rid of it. On the preference, the google is set to my search engine but whenever I search something it uses that search quick site. I don't know how to get rid of it and I want to remove it so bad. The biggest issue is whatever I click, the useless ads (mackeeper, justcloud, seniorsoulmates, McAfee, etc) keeps popping up on the new tabs. Literally, it pops up whenever I click something. It's driving me crazy- what should I do?

Answer 1

Reinstalling OS X Without Erasing the Drive
Boot to the Recovery HD: Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the main menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu.
Reinstall OS X: Select Reinstall OS X and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Also see:
Reinstall OS X Without Erasing the Drive
Choose the version you have installed now:
OS X Yosemite- Reinstall OS X
     Note: You will need an active Internet connection. I suggest using Ethernet
                 if possible because it is three times faster than wireless.