Cannot start XAMPP MySQL InnoDB
171214 is terribly small.  Change my.cnf to set it to about 70% of available RAM.  Example, for a 16GB system, use 11G.  If that antique server is only 2GB, use 500M.

table_cache = 256M is terribly big -- the units is tables, not bytes.  Furthermore, in newer versions, the name is table_open_cache, so:

table_open_cache = 500


(How did the date get there?  171214 = Dec 14, 2017)

Or is the field left blank??

(From Comment, plus annotations)

 [mysqld]
 port   = 3306
 socket = /tmp/mysql.sock
 skip-external-locking
 key_buffer_size = 256M     -- Change to 50M
 max_allowed_packet = 1M
 table_open_cache = 64      -- let's change to 200
 sort_buffer_size = 512K
 net_buffer_length = 8K
 read_buffer_size = 256K
 read_rnd_buffer_size = 512K
 myisam_sort_buffer_size = 8M
 max_connections = 500    -- 100, until you have a good reason for more
 key_buffer = 256M      -- Remove, old spelling
 table_cache = 256M     -- Remove; this is an old spelling
 slow-query-log=1
 slow-query-log-file=D:\TABLETEMP\my.slow.log
 long_query_time=1       -- good
 log_error="mysql_error.log" 

 innodb_buffer_pool_size = 1000M  -- compromise between 'safe' and 'useful'