Clearly something on your system has changed. What system would that be? Model, OS, version?
Ideally, go into Help - System Info..., copy the info and paste it in a post here (redact the serial number iinfo). Yes, it's very long, but put it all in - it can help people drive right to a solution.
Hi noel, I recently switched to Windows 7 32bit, anyway after I installed windows 7 I downloaded the CS6 32bit trial thing, it all worked fine but then the trial ran out so I went back to CS4.
When I went back to CS4 all these problems started so I re-downloaded the trial for CS6 and CS6 had the problems suddenly, then I downloaded CS5 trial and what do you know? Same problem...
I have 3GB RAM, a Dual core 2.6ghz processor and a very capable ASUS GT 440 graphics card, my systems ability isn't the problem.
Your story isn't very coherent. First you say you had the problem with CS4 but then bought CS5 and CS6 all with the same problem.
Then all of a sudden your story is different: you say you installed a new OS, used the CS6 trial until it ran out, and the problem first started after reverting to CS4. Then you say you downloaded the CS5 trial (where did you get that?), had the same problem and re-downloaded the CS6 trial (how did you manage to get that to run after you already used up your trial time?)
Problems with Photoshop can be caused by removing a later version on a computer where a previous version resides, and installing a new OS can introduce new drivers that need updating.
Noel Carboni wrote:
...go into Help - System Info..., copy the info and paste it in a post here (redact the serial number iinfo). Yes, it's very long, but put it all in - it can help people drive right to a solution.
I know what I'm doing Noel you hardly tried...
Noel's the one here who has tried, not you.
When Tools cease to work, as they should, it is often just a matter of Resetting the Tools' Options. If that does not work, then Resetting one's Photoshop Preferences will usually fix things.
As you have now installed many versions of Photoshop (one possibly of questionable provenance), I would Uninstall all that you have. Then download and run the Adobe Creative Suite Cleaner Tool: http://www.adobe.com/support/contact/cscleanertool.html
several times, rebooting between each run.
Then, do a clean install of PS CS4, and Activate that.
If the Tools are still malfunctioning, Reset your Prefs. Note: they will NOT be deleted, with the Uninstall, and I do not think that the Adobe Creative Suite Cleaner Tool will do that either, but have never needed to use it, so I am not speaking from experience here.