Utility Apps Support

whenever i execute 7-zip for at least 1 time, i have problem in removing the USB flash drive from my winxp.. it always says failure in removing and i can only do a hard boot of the machine to get it.. (yeah i know i can simply pull it out without much harm, but i want to be 100% sure of no data loss..)

in 7-zip options, i have selected to associate all file extensions with 7-zip and "integrate 7-zip to shell menu"..

any hint on what the problem is?

TIA..