Windows 7: RunDll error

hey guys.!
i am having a problem with my computer on start up . my computer starts normally but after getting the desktop i get this error "msitpy32.dll missing some programs will not work properly " or close enough to this. i searched this error on google but the google does not even know this name "msitpy32.dll" please help me to get rid of it. otherwise my computer is working perfect. i have winodws7 home premium x64 installed on my pc. Any help would be really appreciated

Try doing a full scan of your system with your anti-virus.

Then do a malware scan using:

Malwarebytes : Free anti-malware download

Post results please.

-Gamer

i have done a full computer scan many times. with avast antivirus :/

Download CCleaner - PC Optimization and Cleaning - Free Download. Do a registry cleaner.

Afterwards restart and post back results

also tried it... still the problem is there :/

Have you recently installed any programs before this started?

this started about a month ago. not because of any software.

Have you tried a system restore?

yeah. i tried it. but the problem is still there. and i dont know the time when the pc was okay so i can restore it to that time.

please reply @honorGamer