Hey Batista.... This is a follow up from another forum on this subject, I might have found the problem... Read on.... Anybody like to comment on this? I know exactly how you feel because I went through this aggravation, for a very long time, until I realized the problem was heat in my machine! and the swap size on my hard drives. If poser is installed on your C drive the same as your OS ( I use XP as well ) you need to allocate a large amount of swap size, My current size on my c drive is 14Gig and sp that windows has enough room to swap and not cause conflicts with other programs. I had tried every thing, I even removed memory out of my machine, leaving in only one chip of 512mb. Still was hanging,and was shutting down on me. I changed my geforce2 to geforce3, still same problem, changed my case to a file server, with 4 fans running in it.. still hang and shut down. Then I went and got a new fan for Athalon, and bingo, my system has not hung or crashed after that. The thing about Athalons is the heat problem, and when doing multiple applications especially 3D it really heats up! I already blew up an Athalon 1.2ghz using poser running on windows 2000. Also disk speed is also very important, if you have a slow hardrive, it can also be a problem, cause he swaps on disks, a bit like Photoshop does, having a big swap file on your c is important to run windows especially XP cause he just eats up the resources. I suggest you try changing you cpu fan to a bigger one, and not buy an orb one, they are the worst ones, I currently have a volcano6 1700 rpm it sounds like I have a plane in my office but, it has not crashed once since I changed it. Also you might consider reinstalling windows, and giving more swap space and increase the size for the C drive. I have one 1gig of ram in my machine, and a geforce3 TI 500 with a 60gig hardrive, and a 1.4ghz Athalon. Time to admit how silly i was once :o) I cleaned my CPU fan then was messing in poser and getting some of the same problems your getting Devon turns...it got worse and worse till the pc was crashing every 5 minutes...turns out i fitted my fan uoside down and the cpu was glowing LOL (still working now though in my sisters pc, good old pentium 300mhz been clocked at 400 since the day they came out ;o).....BUT saying that over on the poser list we are seeing a lot of problem with XP users and also a lot like Ron who have no problems at all, so might be worth looking at the cooling first then maybe the os.....wish i could help more coz i been in a similar problem with NT.... The reason why I agree with &*%^$#@ is because it all fits. YES All the parts of the Computer were new and installed as a MONGREL unit. I was warned and told about the Heating problems with the Athalon CPU and did have extra fans installed. BUT NOT the best ones. My computer is so quite I can't even hear the hard drive working. I have Windows XP professional installed with ALL the latest updates. I even had my computer completely checked over by a certified Microsoft tech who knows a ton about this stuff. This is one area we did NOT check but I did mention to my friend that I thought it was funny that this problem seemed more prevalent in the evenings. That would explain why sometimes the same Poser files would load and other times it wouldn't. I appreciate all your comments though. At least CYBERBABE made sence to me. I hope this is the problem cause I need to fix this now. Thanks DEVON I was just told by my friend that I do indeed have a volcano6 1700 rpm fan on top of my Athalon CPU BUT I have two other cheap fans at the front and back which probably are NOT working as well as they should be for taking air in and out of the tower unit. I also found out that my computers BIO's is set up so that if My CPU goes to a point of being too HOT (FRIED) the system will convert to a 700MHZ cpu speed and slow down to COOL IT OFF. Also having my Tower in an inclosed desk section is not helping it (even if I leave the door open). I went into my Bios to check the temp and It was at 149degrees after running for about 6 hours straight. I don't feel that's overly HOT. What do you think? Like I said before my tech friend set the Bios so if it gets to 165 degrees it will switch the CPU speed to 700MHZ automatically to cool it down. I'm starting the think it might be the swap file/memory and how much is allocated. I still will get the case out of the desk and put in new and more powerful fans. DEVON