Windows 7 is unstable

Hello all!
So...My Windows 7 applications just crash.Not all of them,not all at once.Propably they won't be even the same apps!Sometimes,no crash will occur.I get the "The program stopped working" error,and that's it.After I reboot,I run the same program,and it just runs perfectly.However,something else crashes this time.I believe it has to do with my ram (because different programs crash at different times,and a reboot fixes the problem...for a bit!).I don't have any memory drains though (about 17% of the usable ram is used).
I have done memory diagnostics and nothing came up.I am using both Windows and Linux (Debian and Suse),and both Linux run without a hiccup!
Ok,I know,I have too much ram for nothing,but that doesn't mean it must not work right!
I have reinstalled Windows 7 x64 (Ultimate) 4 times the last 5 months,and the same thing happens.I used to have BSODs,but they seem to have stopped for some reason.I had Windows 7 x86 (Ultimate) installed before,and it ran perfectly.That's what also makes me believe it has to do with the ram(8gb could not be seen by Windows 7 x86).
Oh,and I have installed Windows 7 x64 (Ultimate) from the same disc on my macbook pro,and it runs like a charm.No crashes or whatsoever.
Is there any fix for this?Any configuration I have to do?Fresh installs and repair installs didn't solve the issue.
Thanks in advance!

It could be one of the drivers that is giving you a hard time. Run the DPC Latency Checker and see whether you get any red bars. If yes, there is most likely a driver problem.

Hello !!

Check what is the DEP Setting set to in your Computer usually that used to cause problem. Follow this link for more info Data Execution Prevention: frequently asked questions make sure your Turn it off. Check the Event Viewer for Errors and post them here.

- Captain

@ Capt.Jack Sparrow: Thanks for your reply! I've been playing a bit with Windows settings,and I think I have found something that works...I turned off Dep,crashes kept going on.I also checked my Event Viewer,I was getting exception errors 0xc0000005 on different programs with each reboot.As I said before,the problem has to do with the ram.I set the maximum memory at the boot options (through msconfig) to 4095 mbs and I have no problems so far(after 5 reboots!).The thing is...I have 8gbs of ram and Windows x64,so...ok it's a solution,but obviously not the best one(I am happy that it works fine,though.)!Is there anything else I could try?

Edit:As it seems,I am not the only one with this kind of problem,I've read about similar problems all over the internet,but I haven't found a solution yet.

techyguy said:

@ Capt.Jack Sparrow: Thanks for your reply! I've been playing a bit with Windows settings,and I think I have found something that works...I turned off Dep,crashes kept going on.I also checked my Event Viewer,I was getting exception errors 0xc0000005 on different programs with each reboot.As I said before,the problem has to do with the ram.I set the maximum memory at the boot options (through msconfig) to 4095 mbs and I have no problems so far(after 5 reboots!).The thing is...I have 8gbs of ram and Windows x64,so...ok it's a solution,but obviously not the best one(I am happy that it works fine,though.)!Is there anything else I could try?

Edit:As it seems,I am not the only one with this kind of problem,I've read about similar problems all over the internet,but I haven't found a solution yet.

System Expection code 0xc0000005 bascially refers to some Firewall / Antivirus is blocking some important services like svchost.exe so if you have any uninstall it and see if that makes any difference.

-Captain

Capt.Jack Sparrow said:

techyguy said:

@ Capt.Jack Sparrow: Thanks for your reply! I've been playing a bit with Windows settings,and I think I have found something that works...I turned off Dep,crashes kept going on.I also checked my Event Viewer,I was getting exception errors 0xc0000005 on different programs with each reboot.As I said before,the problem has to do with the ram.I set the maximum memory at the boot options (through msconfig) to 4095 mbs and I have no problems so far(after 5 reboots!).The thing is...I have 8gbs of ram and Windows x64,so...ok it's a solution,but obviously not the best one(I am happy that it works fine,though.)!Is there anything else I could try?

Edit:As it seems,I am not the only one with this kind of problem,I've read about similar problems all over the internet,but I haven't found a solution yet.

System Expection code 0xc0000005 bascially refers to some Firewall / Antivirus is blocking some important services like svchost.exe so if you have any uninstall it and see if that makes any difference.

-Captain

I uninstalled Nod 32,and in this reboot I got no crashes!I am using Windows Firewall,so I doubt that would cause any trouble...I am going to do some more test reboots and see what happens!

Edit:This is the fourth reboot,and no crashes are observed.In the past,my system wouldn't last that long :P Nod 32 was the source of the problem all along!5 months now,nod has been crashing my pc!Thanks Captain,you saved my rig! One question though:Which antivirus should I use now?Anything that compares to the perfomance of nod 32 (plus good compatibility with Windows 7 x64)?

Your Most Welcome !! Glad that you got it working !! Reagrding the AV and Firewall check our sticky threads Security Basics - Windows 7 Forums and What's the Best Anti-virus?. But I like Microsoft Security Essentials

- Captain