No not the power supply.
In this order:
1.
XP Firewall instructions for LW & java access
2.
update your installshield install engine. Then update your java.
3. Open LW & let it run for over 60 mins. Any difference?
ALso some hints on optimising LW:
A well set-up LW can start to automatically continue its dwnlding after it's settled down perhaps 2 out of 3 times you open LW. Optimising LW & Maximising Uplds & Dwnlds A (1st post only) & also Part B which is even better & last & least are search & dwnld hints.