What is this and do I need to get rid of it?

Recently I installed Iobit smartdefrag. Not long afterwards my avast antivirus display this message :

Suspicious file found
A suspicious file has been detected (using a heuristic method). This may be a sign of malware infection. Pls allow the file to be submited to our virus lab for analysis

Filname : C:\WINDOWS\SYSTEM32\d3dim70032.dll
Type : Rootkit : hidden process

I can choose either to delete now or ignore (and the recommended action was ignore).

I would get this message everytime I start up my computer.

Questions:
1) Is this cause by my installing iobit smart defrag or what's the reason for it?
(have disabled the auto defrag but message still appear)

2) Is this dangerous and should I delete?

3) What's the best course of action

FYI, I did submit the file for further analysis as recommended by avast but no help there.

Thanks

 

Im thinking that smartdefrag didn''t infect you, but that is not a file you want on your system. Please visit our malware forums and go through the stickies if you have trouble with it being removed.

 

I agree with Adrynalyne- I've used SmartDefrag many, MANY times and never had it cause anything closely resembling any type of infection. I did a Google search for the file you listed above, and the results tell me it's malware (here's the result list: http://www.google.com/search?q=d3di...s=org.mozilla:en-US:official&client=firefox-a). Again, I agree with the above suggestion: read the Major Geeks Guide To Malware Removal (link: http://forums.majorgeeks.com/showthread.php?t=35407), follow the steps exactly as they're outlined, then post in the Malware Removal forum (link: http://forums.majorgeeks.com/forumdisplay.php?f=35) and the experts there can ehlp you get things straightened out. Good luck!

 

Thanks a lot. Following the advise, I told Avast antivirus to delete it and I think it was deleted as Avast is no longer warning me of this.