[Gmod-help] Lacking Extension!

[evan forsman]

Whenever I load up Gmod, it loads up well. When I check my extensions and addons though, only my Portal game is there, even though I have both that and HL2:Deathmatch! When I go to join a server, it downloads all the files, then sends me back to the main menu. When I want to create a server, or play singleplayer, it loads up all the way to the "Initializing Game Data" message, then gives me an error message: The Instruction at 0x####### referenced memory at 0x#######. The memory could not be 'read'. I verified my files, uninstalled, reinstalled, deleted local content, reinstalled again, and performed a system-wide file check. But there has been no luck. And to top it all off, the maps from HL2:DM are still in the list! My comp specs are thus: Windows XP, Dimension 2400, 512MB RAM, 1500-4000 virtual RAM, 1.5 extra memory in C drive, and an Intel(R) 82845G Graphics Controller. My files are all located in my E drive, not my C drive though, Could this be the problem?
 		 	   		  
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