i have an experia x10 and i try going onto the app store to download apps but they arnt there. so i go on my internet and download it there on my phone that clearly says its for the droid. then i try opening it and it says "for security, your phone is set to block installatiion of applications not sourced in the android market". then i looked it up and people say to get a apk installer so i did and i opened the download to install it and it said the exact same thing about it being not able to install it because of security reasons....is there any thing else i can do to get it on or a setting that i can change?