Fatal Error : Allowed memory… I can’t edit my posts, drafts… etc

First of all let me say that I am very pleased with wordpress, I have been using blogger untill now, and I’ve decided to go with WordPress on my own server because it is actually the plaftform that I was seraching for. I’m not very familiar with PHP, I am working in html for more than 2 years now but le me say that since I’ve started to work with wordpress my head hurts because all of this bugs, seems like I always have to have problems altough everyone says if you read carefuly the instructions everything will be perfect. Well it’s not.

Anyway, I have a lot of problems in the dashboard of wordpress with this Fatal Error, allowed memory … etc. I’ve been searching here and on other sites, and managed to get rid of the error on the first page of the dashboard. The problem is that I keep recieving the error on some important pages as:

On the “Manage Posts page”:

Fatal error: Allowed memory size of 10485760 bytes exhausted (tried to allocate 8208 bytes) in /storage0/home/funportal.ilive.ro/www/wp-includes/cache.php on line 4

Import

Fatal error: Allowed memory size of 10485760 bytes exhausted (tried to allocate 30720 bytes) in /storage0/home/funportal.ilive.ro/www/wp-admin/import/blogware.php on line 55

Basicaly,I’am using an advanced template so it took me like 8 hours to configure it to work properly on my site. When I’m writting an article i have to us the Custom Field section to post an avatar(thumbnail), oterwise I get a picture in the message saying “No picture”. Everytime I use this section and push the “Add custom field” button, the message Is automaticaly saved, so I can’t edit it because I can’t see the manage posts page.

Please do not indicate me other links , or advice me to edit my .htaccess file and increase the memory. I have been trying to do that but:
– i don’t have an .htaccess file on my server (also said in wordpress Browsing .htaccess Oops, no such file exists! Double check the name and try again, merci.
). I’ve created one(used a fix from another site), but when i uploaded the file to the server, the whole server crashed, so I had to delete it. There is though an .ftpquota file on my server, but i can’t download it or edit it.

– i have inserted the code ini_set(‘memory_limit’,’64M’); // set memory to prevent fatal errors in the cache.php file after <? php , but It worked only for the first page of the admin panel.

I’ve looked the 4 and 48 lines in cache.php the ones with the problems, and both are the same: “$data = unserialize(serialize($data));”. Any advice on what to do ??

I also sent an message to my host provider, no answer from them, so you can understand that I have to do this on my own