Hello. Here's my situation: I bought a new laptop (Compaq CQ58-203SM, http://www.bcgroup-online.com/proizvodi/laptop-i-notebook-racunari/hp-Compaq-CQ58_203SM(C6J02EA)+2GB-Sodimm-18368/), downloaded Windows 7 x64 from a trusted web site (msdnaa), installed it, installed drivers* (chipset, ethernet and network adapter; audio driver was already installed), downloaded all programs, like antivirus (Avira), Google Chrome, etc., updated windows multiple times, but after one boot, it was all messed up: first, Windows loaded extremely slow, second, my network adapter and Avira, were uninstalled, which i noticed in Control Panel, as well as uninstalled Google Chrome, Foxit reader, etc., everything except Ethernet driver and Dropbox. The computer still boots very slowly, and it is dysfunctional. I hope I provided you with enough information. Thanks.

*on Compaq site, there were no drivers for this model for Windows 7, only for Windows 8, but I downloaded these http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=5273664&prodTypeId=321957&prodSeriesId=5259206&swLang=13&taskId=135&swEnvOID=4063Kind of surprised that this computer was sold "without" an operating system as (BEZ) in polish indicates on the website. Usually when you have to provide an OS for a system it costs more than buying a system with preinstalled OS, or at least thats the way it is in the USA.

As far as the system being slow, a number of factors can cause this. But the 2GB of RAM this system has is minimal for Windows 7 64. I have had SYSTEMS running way better on 4GB with Windows 7 64 bit. However this system also appears to have other issues before looking into performance bottlenecks.

The only two things I can see that may have caused the issue was performing too many installations/changes without reboots in between to REFRESH and trying to use wrong Windows 7 drivers.

You stated after one boot it was all messed up, and I have seen before if an INSTALLATION asks to reboot and you tell it to reboot later and keep installing other programs etc, upon the reboot that was needed the system boots with errors and problems etc.

My build process for systems is generally installation via Disc to the hard drive. Activate with Microsoft. Install all drivers that were not loaded by default such as audio, network adapters, video card, etc with a reboot after each driver installation. Then perform all security updates/service packs to the OS if it was built using a non-slipstream. Then install optional software and perform a reboot after each installation. Then configure the GUI etc. And finally make a system recovery disc for this system and if its a tower place it in a jewel case and rest it on the bottom of the inside enclosure so its there if ever needed in the future. If its a laptop I will create the system recovery image and save it some place that it will not get lost or damaged to make the next time it is rebuilt a breeze vs the clean installation process which takes more time and sometimes research to find the drivers needed.

As for the lack of drivers for anything but Windows 8 64bit from Compaq, if you cant acquire the chipset details off of compaq's website for all chips requiring drivers ert ( sometimes this information is listed in locations such as the wrong drivers listing as to specifics of what the drivers are for as I did for the Realtek HD Drivers page I linked below.)

Or if the information is still unknown, I'd boot this system off of a Live Linux CD or DVD Disc and take note of what hardware is detected and specifics such as Realtek HD Audio 2330* chipset etc. Then get the Windows 7 driver for that chipset from Realtek support page etc. http://www.realtek.com.tw/downloads/ * 2330 is not your chipset, just an example.

You have to do this for all drivers needed to get them not from compaq, but instead from the chip makers support pages.