OK, I started a new job and got them to buy an old mac for me to do graphics. I have Mac 2GHz Intel Core Duo 2 1 GB 667 Mhz DDR SD ram running OS X 10.7.5 (Lion) I use Firefox and QuarkXpress 9, check email, make pdfs...that's it No other software (just what's standard: iphoto, photo booth, preview, I only uploaded Quark and PDF Reader) All good until about 2 weeks ago. Things were slow. I had some large graphic files, I backed up to CDs. Things still slow. I decided to try to clean cache. I deleted some files I thought were unecessary (languages, programs I don't use etc.) I also deleted Quark 7, forgetting that the upgrade to 9 was a download, I had installed 7 from disc first. Guess I deleted too much. Left it deleting overnight as it said over 9000 files to delete. Worked slower for a day or 2, (quark takes FOREVER to launch, firefox too, mail is slow) Now I can't get it to open at all, grey screen. Did clean boot yesterday, but really couldn't do any work on it. I figured I would reinstall OS. this machine came loaded, but I have Snow Leopard 10.6.3 from home computer. Put disc in, machine launched but couldn't find disc to load OS on... I can do a Clean boot and I opened while holding Command+r, but its all soooo slow!! I can't work like this! Can anyone give me guidance?