I had installed AutoCAD 2005 a month ago and everything is OK till 4 days ago when I open the program, it's not responding or hangs out. I try to do end task from task manager but it takes very2 long time. When it's done I try to reopen the program but it happens again. Sometimes it fixes by itself. Other day, I open a file, a small file, then it happens again and it cause the file's broken and can't be recovered. I use P 4 with 256 M RAM. Any suggestion? Thx.