Malware and rogue remote desktop takeover of my Win 7 management console also wreaked havok with my efforts to reassert normalcy by erasing my installaion disk, converting my 32-bit system to run 64-bit, installing four virtual hard drives, 8 modems, 2 virtual printers while disabling my internet capabilities, printer, cd & dvd drives, and corrupting each anti-malware free/share programs I've employed (Hiren's, kaspersky, Malwarebytes, GMER, etc.). Am I in over my head or is there hope...??? For a replacement Win 7 dvd, Windows points to HP, HP points to place of purchase; Geek Squad (Black Tie, no less). has twice declared system 'Clean' only to be oh, so sadly wrong.
If I had a hammer...I'd hammer in the morning...in the evening... and feel so much better.
I can't speak to the 32 to 64bit conversion, because technically that's not supposed to be possible. But, it does sound like you need a new disk. You probably have Windows 7 Home on your computer (or at least a Win7 Home COA with product key somewhere affixed to it.)
What this means is that any Win7 Home OEM disc will work. Got a friend who has a snazzy new Dell? That disc will work. How about a Gateway? That disc will work.
There are two main non-corporate license types - retail and OEM. Retail are the expensive ones you buy in boxes at Best Buy or Frys and OEM is anything that came attached on a sticker to a PC you bought. Get a disc from one of these, reinstall windows 64 bit (32 is less secure) and watch where you browse from now on!