playing with hikashop then 404 error?

I am working on building a website for another company under a contract for my company. I built their website (with the limited info I was given) in joomla 1.7.2. They wanted a billing system set up for them so I downloaded hikashop and started working with it. Things were all fine and dandy until I went into components>HikaShop>configuration>languages to change some of the text of the buttons. Then I went to the display tab>content modules> HikaShop conent module and changed the display 'add to cart' button to yes. Went back to my website tab and refreshed to a 404 error... Also I have big gaps in my backend joomla tabs now...I used to get this issue with other websites I had built in joomla 1.5 and was always fixed by emptying the cache so since then I have emptied my cache on joomla, tried to restore all of the files through the host and disable all of the hikashop extensions. Still have the 404 error. My boss and I have been thinking It was some type of overflow issue but we are not sure. I am by no means a professional...not a complete noob but still a novice in many ways.

The website is:

www.allen8rwd.com

one of the few pages that still work(not sure why):

www.allen8rwd.com/index.php/component/users/?view=remind

The following are the plugin files I used on the site and have also been attached to this document:

The following files were changed the day these problems started:

stats,
tmp,
Configuration.php - I would assume this to be the file that caused the 404 error but host restorations and even manually pluging in the file from the day before this did not fix the issue.

If anyone has suggestions I would be very thankful and try out what I can to fix the issue.

Dear nicolas,

Thank you for the replay but unfortunatly the "use url rewriting" is turned off, neither the .htaccess nor htaccess.txt files have been changed since way before these issues and turning off SEF urls did not fix the issue

the index.php file is still there =/

I had the SEF turned off but I turned it back on after I had tried a couple things with it off and the page still not getting fixed. Ill try it with deactivating the language filter and ive been clearing the cache every time to make sure its not messing with the site. When you say deactivate the language filter are you talking about the language part of the hikashop plugin or the language filter for joomla?

I just turned SEF off, cleared cache, then disabled the cache,SEF,language filter plugins...sadly the problem still persists =(

sadly i have...

forum.joomla.org/viewtopic.php?f=620&t=706315

been there for days and not 1 reply...

I also talked to my host and they assure me its nothing to do with them but instead its a software issue and they belive it was something that went wrong with 1 of my plugins which would point to you guy again. What should my public $tmp_path= look like? It was one of the few files changed the day these issues started and alot of the errors point to where the temp path is currently located.

so i got rid of all of the old files of my website and rebuilt it from scratch using joomla 2.5.4...today i decided i would give hikashop another chance and downloaded it to find 403 error =/ but then i also had another error saying i didnt have an index page which sounded pretty odd to me so i looked at the files and noticed a .htaccess folder and a .htaccess_old...i found it odd that "dont allow" was all the .htaccess file said so i deleted it and renamed the .htaccess_old file but it wouldnt let me name it .htaccess, only htaccess...i forsee this causing problems so i thought id go back to the forums lol (as of right now the site seems back up and fine after i made the htaccess file change...)