This is my first post in the forum. I have relied on Malwarebytes many times to solve any suspected infection issues. One of my PCs runs Win XP Pro 64-bit. I read the instructions in this forum & downloaded dds.scr and dds.com. Neither will run. An initial MB scan previously detected the following: Malwarebytes Anti-Malware 1.65.1.1000 www.malwarebytes.org Database version: v2012.11.24.02 Windows XP Service Pack 2 x64 NTFS Internet Explorer 8.0.6001.18702 Administrator :: OPTERON175 [administrator] 11/23/2012 11:10:54 PM mbam-log-2012-11-23 (23-10-54).txt Scan type: Full scan (F:\|) Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM Scan options disabled: P2P Objects scanned: 267905 Time elapsed: 32 minute(s), 36 second(s) Memory Processes Detected: 0 (No malicious items detected) Memory Modules Detected: 0 (No malicious items detected) Registry Keys Detected: 0 (No malicious items detected) Registry Values Detected: 1 HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run|Regedit32 (Trojan.Agent) -> Data: F:\WINDOWS\SysWow64\regedit.exe -> Quarantined and deleted successfully. Registry Data Items Detected: 0 (No malicious items detected) Folders Detected: 0 (No malicious items detected) Files Detected: 1 F:\WINDOWS\SysWOW64\regedit.exe (Trojan.Agent) -> Delete on reboot. (end) They were successfully deleted & a follow-up scan found no threats. Two days later I ran another scan & it found the same items, which again were deleted. I'm not sure why it is reoccurring. That is why I tried the two dds files, but they can't help. Is this serious? I have noticed constant network activity on this PC even when no browser or email program is open. I disabled the network card until I can find out what is causing this. Thanks.