There are many different all-in-one PC Tools type programs available, so which "PC Tools" did you install, specifically?
Have you considered contacting the developer about this problem?
Unless they can offer specific help/suggestions... and given that you've already tried Safe Mode etc, I suspect you may have to either restore your system to its factory settings (using the 'Recovery' partition), or do a 'Repair' install of the OS emoticon.Sad.title
From experience, I've found that: “Beautyis in the eye of the beer-holder”!!
Smoke Grey Magnesium Alloy Chassis - with White LED Backlights 17" UltraSharp WUXGA Widescreen TFT (1920 x 1200) with TrueLife Intel Core 2 Duo Processor T9300 @ 2.50GHz (800 MHz FSB, 4MB L2 cache) 4GB (2x 2GB) Patriot Signature PC2-5400 @ 667MHz DUAL 512MB Nvidia 8800M GTX cards in SLi + 128MB Ageia PhysX 640GB SATA II (2x 320GB WD Scorpio Black 7200rpm) 8x Super-Multi DVD±RW Creative X-Fi Notebook (ExpressCard) + Creative GigaWorks T40 Series II Integrated 2MP Webcam Dell Wireless 355 Bluetooth 2.0 Module Intel Next-Gen Wireless-N Mini-Card TV Tuner and Dell Travel Remote Control 4-in-1 Flash Card Reader (SSD/MMC/MS Pro/xD)