I have a problem with three of these programs, and I just recently got rid of a trojan virus. -Regedit When I run regedit, the command prompt pops up and then quickly goes away (regedit.exe works fine though) -Disk Defragmenter When I run Disk Defragmenter, I get this error, "MMC cannot open the file C:\WINDOWS\system32\dfrg.msc. This may be because the file does not exist, or was created by a later version of MMC. This may also be because you do not have sufficient access rights to the file." -Search Companion When I run Search Companion, I get this error, "The file that is required to run Search Companion cannot be found. You may need to run setup". Then when it opens, the whole thing is blank.