Yesterday, my computer began flashing that horrible Personal Antivirus trojan. It told me I had hundreds of viruses, worms, and other crap… and please, download our wonderful Personal Antivirus program to get rid of them all! I knew better, and tried to close it out, but it kept reappearing… During this time, my web browser and several other programs also refused to start.
I restarted a couple of times, which seemed to solve the problem. But later, I noticed that my Internet browser (Google Chrome) was experiencing some weird effects as well. Sometimes, when I clicked links, it would take me to a page I didn’t intend to visit… A page filled with ads. The only way to successfully navigate the web was to copy the link address and paste it into the URL bar. Again I restarted, which seemed to more or less solve the problem… Though it recurs every now and then.
Now, every time I boot my computer, it shows me a dialog about Google Installer encountering a problem and needing to close, and do I want to send an error report. This usually happens two to five times every time I start, and appears additionally every few minutes… When I follow the link for More Information after sending the error report, it takes me to a Microsoft page about a malware called UACd.sys with some websites with suggested solutions. However, I have attempted all of these and it does not appear to me that the virus I have is in fact UACd.sys. It could be a related one, but I don’t think anything with that name exists on my computer… I’ve looked high and low for it.
My antivirus program, AVG, didn’t recognize any threats when I ran it. Spybot would not run either, no matter how many times I tried. I also downloaded Malwarebytes Anti-Malware after seeing several websites suggest it, but for some reason I am not able to run the installation file. I suspect this is also related to my virus.
My computer has frozen several times during this adventure, and I have often resorted to pulling the plug to get it to reboot…
I am running Windows XP SP3 Tablet Edition on an HP TC1100.
Any help at all would be very, very appreciated. I don’t have a lot of technical experience with computers, but I know how most things work… Making any instructions or suggestions as explicit as possible would therefore be very helpful 
Thank you so much for your time