Windows 7 Audio Service keeps stopping

Hi Guys,

My laptop keeps disabling the audio service at random times, for the last few weeks.
It doesn't stay enabled for very long. There doesn't seem to be a pattern when it works or doesn't work.

I've tried so far:

audio service is set to automatic
uninstalled Realtek drivers/restart/reinstall drivers
update drivers - all drivers current
updated windows
disabled all startup items msconfig
ran directx sound tests >allok
updated plugins on firefox
ran cc cleaner
ran anti-virus, malwarebytes
check drivers for errors - no errors
checked sound options - allok

I've also tried everything in this thread, however I don't get any errors, it simply stops working. When I enable it, it works once again.

Inexplicably, the issue has started on my other laptop as well.

Anyone want to have a crack at it? Re-installing windows isn't an option, this is a refurbished computer I got from my old work and kept when I left. No cds for anything.

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Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Pentium(R) Dual-Core CPU T4400 @ 2.20GHz, Intel64 Family 6 Model 23 Stepping 10
Processor Count: 2
RAM: 4025 Mb
Graphics Card: Mobile Intel(R) 4 Series Express Chipset Family, 1820 Mb
Hard Drives: C: Total - 292850 MB, Free - 110419 MB;
Motherboard: Acer, Aspire 5732Z
Antivirus: Microsoft Security Essentials, Updated and Enabled