Run scheduled tasks at same time?

[Guest]

For security I have running on my computer:

Avast 4.7 Home edition, Spybot 1.4 free version,

AVG 7.5 free edition and Windows Defender with
the Malicious software tool.

Can I set them all to perform their scheduled tasks

at the same time? I only use my computer for about
4-5 hours per day and running all these tasks one after
another takes a long time and slows down computer
performance.

System: ACER TravelMate 2451WLMi

Intel Celeron M processor 410
1.46 GHz, 533 MHz FSB, 1MB L2 cache
Windows XP-SP2, Home Edition
Windows Internet Explorer 7

 

[Poprivet]

AVG 7.5 free edition and Windows Defender with
the Malicious software tool.
at the same time? I only use my computer for about
4-5 hours per day and running all these tasks one after
another takes a long time and slows down computer
performance.
Intel Celeron M processor 410
1.46 GHz, 533 MHz FSB, 1MB L2 cache
Windows XP-SP2, Home Edition
Windows Internet Explorer 7

Maybe. Then again, they might see each other as suspicious activity. Only
way to really know is try it, and if anything finds something, rerun the
test by itself to see if it's still found. Ymmv for sure.
Or, you may just get error messages.