Need help just got mangeto 1.9.2 every time i try to install extension i see success. but when i try to open admin it cant open it shows htt or error 505 and sometimes my main page dont open i have to delete the extention to get all back again to restart .
Do you have compilation mode turned on?
Before installing new extension, turn off compilation in System -> Tools -> Compilation.
Then install new extension and clear the cache, either from Magento Admin, or if it's not available, just clear var/cache/* content.