I am sorry about the problem you are having. Viruses are very painful things to work with. But to be able to best help you I will need to know the model of the video card you are using. This is because the information provided VEN_1002&DEV_5A61&CC_0300 is for the ATI manufacturer. I will also recommend to check under program installed and uninstall anything related to ATI or Video cards. Then download and install the latest video card driver for you system.
Hi saif 7300,
I'm not an expert on graphics drivers, but if you have an Intel Desktop Board with integrated ATI Radeon* Xpress 200 Graphics, you should try installing these drivers:
Even if you don't have an Intel Desktop Board, the drivers might work because VEN_1002&DEV_5A61 is the hardware ID for ATI Radeon Xpress 200 per PCI Vendor and Device Lists.
I hope this helps.