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If you have access to phpMyAdmin you can manually edit these values back to their originals and hopefully get you back into your website.
Always create a backup of your XOOPS database before you start manually editing it. That way you can restore it if something terrible happens.
1. Open phpMyAdmin and locate the database you are using for your website (The Name you used when installing Xoops)
2. When you have located this database, find a table that ends with 'config' in the lefthand window. (for example if your XOOPS database prefix is 'xoops_', then the table will look like 'xoops_config'.)
3. Once you have completed the previous step, in the main window click on the 'Browser Tab'.
4. Look down the table for a fields and change the values to the ones below:
'session_expire' = 15,
'session_name' = xoops_session,
'use_mysession' = 0
If you don't feel comfortable doing this, I would suggest that ask someone who has a little more knowledge dealing with phpMyAdmin.
This may help you get back into your website, but if it doesn't, come back and we will help you a little further.