hi COLING
please check your ie security, if it is set to high this will stop mfp from using ie browser, remember v8 is a new software to all your antivirus,firewall and any other software you have,so you may have to give v8 full access.
also you cannot delete a file when in use, to delete the file you would have to close all instances of mfp, then delete the file.
mcbee