Three things:

1. Unistall your McAfee Firewall, (Privacy Service and Spamkiller in case you have it) but do not ever unistall McAfee Anti-Virus.

2. Right click on the Desktop>Personalize>Windows Color and Appearance>Select Windows Vista Basic and click OK.

3. Download LimeWire Beta 4.13

Beliveve after this you'll be ready to go.
good luck!!