Magento Error "Cannot find save handler 'memcache'

I am unsure how this has come about but today my website was a blank white screen when i took a look at it. I tried to debug this and have found errors.

The errors were for "Magento Front controller reached 100 router match iterations” on some parts of the website also. Also "500 server error" but were intermittent.

After seeing one of the errors was to do with the cache plugin and memcache i decided to disable that plugin which then brought my site back.

However i still have issues with a lot of my remaining plugins and would like to get to the bottom of it. When i enable error reporting on my site it now shows.

    Warning: ini_set(): Cannot find save handler 'memcache'  in        /home/sites/domain.com/public_html/app/code/core/Mage/Core/Model/Session/Abstract/Varien.php on line 56

#0 [internal function]: mageCoreErrorHandler(2, 'ini_set(): Cann...', '/home/sites/dom...', 56, Array)
#1 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Model/Session/Abstract/Varien.php(56): ini_set('session.save_ha...', 'memcache')
#2 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Model/Session/Abstract/Varien.php(166): Mage_Core_Model_Session_Abstract_Varien->start('frontend')
#3 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Model/Session/Abstract.php(84): Mage_Core_Model_Session_Abstract_Varien->init('core', 'frontend')
#4 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Model/Session.php(42): Mage_Core_Model_Session_Abstract->init('core', 'frontend')
#5 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Model/Config.php(1348): Mage_Core_Model_Session->__construct(Array)
#6 /home/sites/domain.com/public_html/app/Mage.php(462): Mage_Core_Model_Config->getModelInstance('core/session', Array)
#7 /home/sites/domain.com/public_html/app/Mage.php(476): Mage::getModel('core/session', Array)
#8 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(494): Mage::getSingleton('core/session', Array)
#9 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Controller/Front/Action.php(64): Mage_Core_Controller_Varien_Action->preDispatch()
#10 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(408): Mage_Core_Controller_Front_Action->preDispatch()
#11 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('index')
#12 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#13 /home/sites/domain.com/public_html/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#14 /home/sites/domain.com/public_html/app/Mage.php(683): Mage_Core_Model_App->run(Array)
#15 /home/sites/domain.com/public_html/index.php(112): Mage::run('', 'store')
#16 {main}

I have restored my site from a couple of day old backup and tried my best to google the problem but the issue is still there so am wondering if anyone has experienced something like this and weather it is more server related or to do with my magento installation? as am unsure what has even changed recently for me to change back other than recent security patches.