I know you have a new comp, but disc problem can mean that you don't have enough room left....But there are other reasons as well...
Have a look at Birdy's links in this thread and see if a solution is within...
http://www.gnutellaforums.com/showpo...11&postcount=2
BTW we got this info from one of the developers yesterday, so this could apply to you as well....
http://www.limewire.org/forum/showpo...66&postcount=2