having a little trouble since installing marketPress

Hey Guys,

I installed marketpress , defender, hummingbird and snapshot on one of my sites , and sadly the site now doesnt work giving me out of memory problems ie:
Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 12288 bytes) in /home/sarafirthart/public_html/wp-content/plugins/snapshot/lib/Snapshot/Model/Destination/aws/AWSSDKforPHP/services/s3.class.php on line 2040

unfortunately i cant log into wp-admin to give access

any help will be muchly apreciated.
Regards
Luke