I'm not from LimeWire but something is amiss in your hard drive directory and Disk First Aid is trying to fix it. Sometimes Disk First Aid can't fix it. To see if the problem is still there, open the Disk First Aid application after your computer starts up and verify your disks, repairing if necessary. Verify again if you repair to be sure all problems are fixed. If you have Norton Utilities, TechTool, or another disk repair program try running that. You certainly have enough RAM.