I don't know if it comes in helpful, but this post mentions GIMP.
Just to let you know that i've found a system from http://www.portableapps.com
Which has a portable version of GIMP which comes in very useful!
Espically when your at work or away from home or the office.
All you have to do is install it onto a pen drive.
There is alot of apps available for it!
And its got me out of alot of problems in the last couple of months!